Merge branch 'master' into fixes/2512-xaml-namescope-registration

7 years ago · 848f50b523
84 changed files with 747 additions and 152 deletions
--- a/.ncrunch/Avalonia.Animation.UnitTests.net47.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Animation.UnitTests.net47.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Animation.UnitTests.netcoreapp2.0.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Animation.UnitTests.netcoreapp2.0.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Animation.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Animation.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Base.UnitTests.net47.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Base.UnitTests.net47.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Base.UnitTests.netcoreapp2.0.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Base.UnitTests.netcoreapp2.0.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Base.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Base.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Benchmarks.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Benchmarks.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Build.Tasks.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Build.Tasks.v3.ncrunchproject
@ -0,0 +1,5 @@
+<ProjectConfiguration>
+  <Settings>
+    <IgnoreThisComponentCompletely>True</IgnoreThisComponentCompletely>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Controls.DataGrid.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Controls.DataGrid.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Controls.UnitTests.net47.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Controls.UnitTests.net47.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Controls.UnitTests.netcoreapp2.0.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Controls.UnitTests.netcoreapp2.0.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Controls.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Controls.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Designer.HostApp.net461.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Designer.HostApp.net461.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Designer.HostApp.netcoreapp2.0.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Designer.HostApp.netcoreapp2.0.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.DesignerSupport.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.DesignerSupport.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.DesktopRuntime.net461.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.DesktopRuntime.net461.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.DesktopRuntime.netcoreapp2.0.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.DesktopRuntime.netcoreapp2.0.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Diagnostics.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Diagnostics.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Direct2D1.RenderTests.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Direct2D1.RenderTests.v3.ncrunchproject
@ -4,6 +4,9 @@
      <Value>..\TestFiles\Direct2D1\**.*</Value>
    </AdditionalFilesToIncludeForProject>
    <DefaultTestTimeout>3000</DefaultTestTimeout>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Direct2D1.UnitTests.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Direct2D1.UnitTests.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Direct2D1.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Direct2D1.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Gtk3.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Gtk3.v3.ncrunchproject
@ -1,3 +1,7 @@
 <ProjectConfiguration>
-  <Settings />
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Input.UnitTests.net47.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Input.UnitTests.net47.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Input.UnitTests.netcoreapp2.0.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Input.UnitTests.netcoreapp2.0.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Input.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Input.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Interactivity.UnitTests.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Interactivity.UnitTests.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Interactivity.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Interactivity.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Layout.UnitTests.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Layout.UnitTests.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Layout.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Layout.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.LeakTests.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.LeakTests.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.LinuxFramebuffer.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.LinuxFramebuffer.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Logging.Serilog.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Logging.Serilog.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Markup.UnitTests.net47.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Markup.UnitTests.net47.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Markup.UnitTests.netcoreapp2.0.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Markup.UnitTests.netcoreapp2.0.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Markup.Xaml.UnitTests.net47.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Markup.Xaml.UnitTests.net47.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Markup.Xaml.UnitTests.netcoreapp2.0.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Markup.Xaml.UnitTests.netcoreapp2.0.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Markup.Xaml.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Markup.Xaml.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Markup.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Markup.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.OpenGL.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.OpenGL.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.ReactiveUI.UnitTests.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.ReactiveUI.UnitTests.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.ReactiveUI.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.ReactiveUI.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Skia.RenderTests.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Skia.RenderTests.v3.ncrunchproject
@ -4,6 +4,9 @@
      <Value>..\TestFiles\Skia\**.*</Value>
    </AdditionalFilesToIncludeForProject>
    <DefaultTestTimeout>3000</DefaultTestTimeout>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Skia.UnitTests.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Skia.UnitTests.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Skia.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Skia.v3.ncrunchproject
@ -1,3 +1,7 @@
 <ProjectConfiguration>
-  <Settings />
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Styling.UnitTests.net47.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Styling.UnitTests.net47.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Styling.UnitTests.netcoreapp2.0.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Styling.UnitTests.netcoreapp2.0.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Styling.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Styling.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Themes.Default.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Themes.Default.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.UnitTests.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.UnitTests.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Visuals.UnitTests.net47.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Visuals.UnitTests.net47.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Visuals.UnitTests.netcoreapp2.0.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Visuals.UnitTests.netcoreapp2.0.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.Visuals.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Visuals.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Win32.Interop.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Win32.Interop.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.Win32.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.Win32.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/Avalonia.X11.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.X11.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.netcoreapp2.0.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.netcoreapp2.0.v3.ncrunchproject
@ -0,0 +1,8 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>DerivedFilesIncludedInWorkspace</Value>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Avalonia.netstandard2.0.v3.ncrunchproject
+++ b/.ncrunch/Avalonia.netstandard2.0.v3.ncrunchproject
@ -0,0 +1,8 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>DerivedFilesIncludedInWorkspace</Value>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/.ncrunch/Direct3DInteropSample.v3.ncrunchproject
+++ b/.ncrunch/Direct3DInteropSample.v3.ncrunchproject
@ -1,5 +1,8 @@
 <ProjectConfiguration>
  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
    <PreviouslyBuiltSuccessfully>True</PreviouslyBuiltSuccessfully>
  </Settings>
 </ProjectConfiguration>
--- a/.ncrunch/PlatformSanityChecks.v3.ncrunchproject
+++ b/.ncrunch/PlatformSanityChecks.v3.ncrunchproject
@ -0,0 +1,7 @@
+<ProjectConfiguration>
+  <Settings>
+    <HiddenComponentWarnings>
+      <Value>MissingOrIgnoredProjectReference</Value>
+    </HiddenComponentWarnings>
+  </Settings>
+</ProjectConfiguration>
--- a/samples/ControlCatalog.Desktop/Program.cs
+++ b/samples/ControlCatalog.Desktop/Program.cs
@ -26,8 +26,7 @@ namespace ControlCatalog
            => AppBuilder.Configure<App>()
                .LogToDebug()
                .UsePlatformDetect()
-                .UseReactiveUI()
-                .UseDataGrid();
+                .UseReactiveUI();

        private static void ConfigureAssetAssembly(AppBuilder builder)
        {
--- a/samples/ControlCatalog.NetCore/Program.cs
+++ b/samples/ControlCatalog.NetCore/Program.cs
@ -47,8 +47,7 @@ namespace ControlCatalog.NetCore
            => AppBuilder.Configure<App>()
                .UsePlatformDetect()
                .UseSkia()
-                .UseReactiveUI()
-                .UseDataGrid();
+                .UseReactiveUI();

        static void ConsoleSilencer()
        {
--- a/samples/ControlCatalog/SideBar.xaml
+++ b/samples/ControlCatalog/SideBar.xaml
@ -56,7 +56,7 @@
        <Setter Property="Opacity" Value="0.5"/>
        <Setter Property="Transitions">
            <Transitions>
-                <DoubleTransition Property="Opacity" Duration="0:0:0.5"/>
+                <DoubleTransition Property="Opacity" Duration="0:0:0.150"/>
            </Transitions>
        </Setter>
    </Style>
--- a/samples/RenderDemo/SideBar.xaml
+++ b/samples/RenderDemo/SideBar.xaml
@ -47,7 +47,7 @@
        <Setter Property="Opacity" Value="0.5"/>
        <Setter Property="Transitions">
            <Transitions>
-                <DoubleTransition Property="Opacity" Duration="0:0:0.5"/>
+                <DoubleTransition Property="Opacity" Duration="0:0:0.150"/>
            </Transitions>
        </Setter>
    </Style>
--- a/samples/interop/WindowsInteropTest/Program.cs
+++ b/samples/interop/WindowsInteropTest/Program.cs
@ -15,7 +15,7 @@ namespace WindowsInteropTest
        {
            System.Windows.Forms.Application.EnableVisualStyles();
            System.Windows.Forms.Application.SetCompatibleTextRenderingDefault(false);
-            AppBuilder.Configure<App>().UseWin32().UseDirect2D1().UseDataGrid().SetupWithoutStarting();
+            AppBuilder.Configure<App>().UseWin32().UseDirect2D1().SetupWithoutStarting();
            System.Windows.Forms.Application.Run(new SelectorForm());
        }
    }
--- a/src/Avalonia.Animation/Animatable.cs
+++ b/src/Avalonia.Animation/Animatable.cs
@ -7,7 +7,7 @@ using System.Linq;
 using System.Reactive.Linq;
 using Avalonia.Collections;
 using Avalonia.Data;
-using Avalonia.Animation.Animators; 
+using Avalonia.Animation.Animators;

 namespace Avalonia.Animation
 {
@ -36,13 +36,27 @@ namespace Avalonia.Animation

        private Transitions _transitions;

+        private Dictionary<AvaloniaProperty, IDisposable> _previousTransitions;
+
        /// <summary>
        /// Gets or sets the property transitions for the control.
        /// </summary>
        public Transitions Transitions
        {
-            get { return _transitions ?? (_transitions = new Transitions()); }
-            set { SetAndRaise(TransitionsProperty, ref _transitions, value); }
+            get
+            {
+                if (_transitions == null)
+                    _transitions = new Transitions();
+
+                if (_previousTransitions == null)
+                    _previousTransitions = new Dictionary<AvaloniaProperty, IDisposable>();
+
+                return _transitions;
+            }
+            set
+            {
+                SetAndRaise(TransitionsProperty, ref _transitions, value);
+            }
        }

        /// <summary>
@ -52,13 +66,18 @@ namespace Avalonia.Animation
        /// <param name="e">The event args.</param>
        protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs e)
        {
-            if (e.Priority != BindingPriority.Animation && Transitions != null)
+            if (e.Priority != BindingPriority.Animation && Transitions != null && _previousTransitions != null)
            {
                var match = Transitions.FirstOrDefault(x => x.Property == e.Property);

                if (match != null)
                {
-                    match.Apply(this, Clock ?? Avalonia.Animation.Clock.GlobalClock, e.OldValue, e.NewValue);
+                    if (_previousTransitions.TryGetValue(e.Property, out var dispose))
+                        dispose.Dispose();
+
+                    var instance = match.Apply(this, Clock ?? Avalonia.Animation.Clock.GlobalClock, e.OldValue, e.NewValue);
+
+                    _previousTransitions[e.Property] = instance;
                }
            }
        }
--- a/src/Avalonia.Animation/Properties/AssemblyInfo.cs
+++ b/src/Avalonia.Animation/Properties/AssemblyInfo.cs
@ -3,7 +3,10 @@

 using Avalonia.Metadata;
 using System.Reflection;
+using System.Runtime.CompilerServices;

 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Animation")]
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Animation.Easings")]
-[assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Animation.Animators")]
+[assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Animation.Animators")]
+
+[assembly: InternalsVisibleTo("Avalonia.LeakTests")]
--- a/src/Avalonia.Animation/TransitionInstance.cs
+++ b/src/Avalonia.Animation/TransitionInstance.cs
@ -30,13 +30,16 @@ namespace Avalonia.Animation
        {
            var interpVal = (double)t.Ticks / _duration.Ticks;

-            if (interpVal > 1d || interpVal < 0d)
+            // Clamp interpolation value.
+            if (interpVal >= 1d | interpVal < 0d)
            {
+                PublishNext(1d);
                PublishCompleted();
-                return;
            }
-
-            PublishNext(interpVal);
+            else
+            {
+                PublishNext(interpVal);
+            }
        }

        protected override void Unsubscribed()
--- a/src/Avalonia.Controls.DataGrid/AppBuilderExtensions.cs
+++ b/src/Avalonia.Controls.DataGrid/AppBuilderExtensions.cs
@ -1,20 +0,0 @@
-// Copyright (c) The Avalonia Project. All rights reserved.
-// Licensed under the MIT license. See licence.md file in the project root for full license information.
-
-using Avalonia.Controls;
-using Avalonia.Threading;
-
-namespace Avalonia
-{
-    public static class AppBuilderExtensions
-    {
-        public static TAppBuilder UseDataGrid<TAppBuilder>(this TAppBuilder builder)
-            where TAppBuilder : AppBuilderBase<TAppBuilder>, new()
-        {
-            // Portable.Xaml doesn't correctly load referenced assemblies and so doesn't
-            // find `DataGrid` when loading XAML. Call this method from AppBuilder as a
-            // temporary workaround until we fix XAML.
-            return builder;
-        }
-    }
-}
--- a/src/Avalonia.Controls/AppBuilderBase.cs
+++ b/src/Avalonia.Controls/AppBuilderBase.cs
@ -148,13 +148,20 @@ namespace Avalonia.Controls

        public delegate void AppMainDelegate(Application app, string[] args);

+        public void Start()
+        {
+            Setup();
+            BeforeStartCallback(Self);
+            Instance.Run();
+        }
+
        public void Start(AppMainDelegate main, string[] args)
        {
            Setup();
            BeforeStartCallback(Self);
            main(Instance, args);
        }
-        
+
        /// <summary>
        /// Sets up the platform-specific services for the application, but does not run it.
        /// </summary>
@ -220,13 +227,13 @@ namespace Avalonia.Controls
        /// <summary>
        /// Sets the shutdown mode of the application.
        /// </summary>
-        /// <param name="exitMode">The shutdown mode.</param>
+        /// <param name="shutdownMode">The shutdown mode.</param>
        /// <returns></returns>
-        public TAppBuilder SetExitMode(ExitMode exitMode)
+        public TAppBuilder SetShutdownMode(ShutdownMode shutdownMode)
        {
-            Instance.ExitMode = exitMode;
+            Instance.ShutdownMode = shutdownMode;
            return Self;
-        }      
+        }

        protected virtual bool CheckSetup => true;

--- a/src/Avalonia.Controls/Application.cs
+++ b/src/Avalonia.Controls/Application.cs
@ -43,8 +43,8 @@ namespace Avalonia
        private readonly Styler _styler = new Styler();
        private Styles _styles;
        private IResourceDictionary _resources;
-
        private CancellationTokenSource _mainLoopCancellationTokenSource;
+        private int _exitCode;

        /// <summary>
        /// Initializes a new instance of the <see cref="Application"/> class.
@ -52,10 +52,14 @@ namespace Avalonia
        public Application()
        {
            Windows = new WindowCollection(this);
-
-            OnExit += OnExiting;
        }

+        /// <inheritdoc/>
+        public event EventHandler<StartupEventArgs> Startup;
+
+        /// <inheritdoc/>
+        public event EventHandler<ExitEventArgs> Exit;
+
        /// <inheritdoc/>
        public event EventHandler<ResourcesChangedEventArgs> ResourcesChanged;

@ -164,14 +168,14 @@ namespace Avalonia
        IResourceNode IResourceNode.ResourceParent => null;

        /// <summary>
-        /// Gets or sets the <see cref="ExitMode"/>. This property indicates whether the application exits explicitly or implicitly. 
-        /// If <see cref="ExitMode"/> is set to OnExplicitExit the application is only closes if Exit is called.
+        /// Gets or sets the <see cref="ShutdownMode"/>. This property indicates whether the application is shutdown explicitly or implicitly. 
+        /// If <see cref="ShutdownMode"/> is set to OnExplicitShutdown the application is only closes if Shutdown is called.
        /// The default is OnLastWindowClose
        /// </summary>
        /// <value>
        /// The shutdown mode.
        /// </value>
-        public ExitMode ExitMode { get; set; }
+        public ShutdownMode ShutdownMode { get; set; }

        /// <summary>
        /// Gets or sets the main window of the application.
@ -190,108 +194,171 @@ namespace Avalonia
        public WindowCollection Windows { get; }

        /// <summary>
-        /// Gets or sets a value indicating whether this instance is existing.
+        /// Gets or sets a value indicating whether this instance is shutting down.
        /// </summary>
        /// <value>
-        ///   <c>true</c> if this instance is existing; otherwise, <c>false</c>.
+        ///   <c>true</c> if this instance is shutting down; otherwise, <c>false</c>.
        /// </value>
-        internal bool IsExiting { get; set; }
+        internal bool IsShuttingDown { get; private set; }

        /// <summary>
        /// Initializes the application by loading XAML etc.
        /// </summary>
-        public virtual void Initialize()
+        public virtual void Initialize() { }
+
+        /// <summary>
+        /// Runs the application's main loop.
+        /// </summary>
+        /// <remarks>
+        /// This will return when the <see cref="Avalonia.Controls.ShutdownMode"/> condition is met
+        /// or <see cref="Shutdown(int)"/> was called. 
+        /// </remarks>
+        /// <returns>The application's exit code that is returned to the operating system on termination.</returns>
+        public int Run()
        {
+            return Run(new CancellationTokenSource());
        }

        /// <summary>
-        /// Runs the application's main loop until the <see cref="ICloseable"/> is closed.
+        /// Runs the application's main loop.
        /// </summary>
-        /// <param name="closable">The closable to track</param>
-        public void Run(ICloseable closable)
+        /// <remarks>
+        /// This will return when the <see cref="Avalonia.Controls.ShutdownMode"/> condition is met
+        /// or <see cref="Shutdown(int)"/> was called.
+        /// This also returns when <see cref="ICloseable"/> is closed.
+        /// </remarks>
+        /// <param name="closable">The closable to track.</param>
+        /// <returns>The application's exit code that is returned to the operating system on termination.</returns>
+        public int Run(ICloseable closable)
        {
-            if (_mainLoopCancellationTokenSource != null)
+            closable.Closed += (s, e) => _mainLoopCancellationTokenSource?.Cancel();
+
+            return Run(new CancellationTokenSource());
+        }
+
+        /// <summary>
+        /// Runs the application's main loop.
+        /// </summary>
+        /// <remarks>
+        /// This will return when the <see cref="Avalonia.Controls.ShutdownMode"/> condition is met
+        /// or <see cref="Shutdown(int)"/> was called.
+        /// </remarks>
+        /// <param name="mainWindow">The window that is used as <see cref="MainWindow"/>
+        /// when the <see cref="MainWindow"/> isn't already set.</param>
+        /// <returns>The application's exit code that is returned to the operating system on termination.</returns>
+        public int Run(Window mainWindow)
+        {
+            if (mainWindow == null)
            {
-                throw new Exception("Run should only called once");
+                throw new ArgumentNullException(nameof(mainWindow));
            }

-            closable.Closed += (s, e) => Exit();
-
-            _mainLoopCancellationTokenSource = new CancellationTokenSource();
+            if (MainWindow == null)
+            {
+                Dispatcher.UIThread.Post(() =>
+                {
+                    if (!mainWindow.IsVisible)
+                    {
+                        mainWindow.Show();
+                    }

-            Dispatcher.UIThread.MainLoop(_mainLoopCancellationTokenSource.Token);
+                    MainWindow = mainWindow;
+                });
+            }            

-            // Make sure we call OnExit in case an error happened and Exit() wasn't called explicitly
-            if (!IsExiting)
-            {
-                OnExit?.Invoke(this, EventArgs.Empty);
-            }
+            return Run(new CancellationTokenSource());
        }
-
        /// <summary>
-        /// Runs the application's main loop until some condition occurs that is specified by ExitMode.
+        /// Runs the application's main loop.
        /// </summary>
-        /// <param name="mainWindow">The main window</param>
-        public void Run(Window mainWindow)
+        /// <remarks>
+        /// This will return when the <see cref="Avalonia.Controls.ShutdownMode"/> condition is met
+        /// or <see cref="Shutdown(int)"/> was called.
+        /// This also returns when the <see cref="CancellationToken"/> is canceled.
+        /// </remarks>
+        /// <returns>The application's exit code that is returned to the operating system on termination.</returns>
+        /// <param name="token">The token to track.</param>
+        public int Run(CancellationToken token)
        {
-            if (_mainLoopCancellationTokenSource != null)
+            return Run(CancellationTokenSource.CreateLinkedTokenSource(token));
+        }
+
+        private int Run(CancellationTokenSource tokenSource)
+        {
+            if (IsShuttingDown)
            {
-                throw new Exception("Run should only called once");
+                throw new InvalidOperationException("Application is shutting down.");
            }

-            _mainLoopCancellationTokenSource = new CancellationTokenSource();
-
-            if (MainWindow == null)
+            if (_mainLoopCancellationTokenSource != null)
            {
-                if (mainWindow == null)
-                {
-                    throw new ArgumentNullException(nameof(mainWindow));
-                }
+                throw new InvalidOperationException("Application is already running.");
+            }

-                if (!mainWindow.IsVisible)
-                {
-                    mainWindow.Show();
-                }
+            _mainLoopCancellationTokenSource = tokenSource;

-                MainWindow = mainWindow;
-            }           
+            Dispatcher.UIThread.Post(() => OnStartup(new StartupEventArgs()), DispatcherPriority.Send);

            Dispatcher.UIThread.MainLoop(_mainLoopCancellationTokenSource.Token);

-            // Make sure we call OnExit in case an error happened and Exit() wasn't called explicitly
-            if (!IsExiting)
+            if (!IsShuttingDown)
            {
-                OnExit?.Invoke(this, EventArgs.Empty);
+                Shutdown(_exitCode);
            }
+
+            return _exitCode;
        }

        /// <summary>
-        /// Runs the application's main loop until the <see cref="CancellationToken"/> is canceled.
+        /// Raises the <see cref="Startup"/> event.
        /// </summary>
-        /// <param name="token">The token to track</param>
-        public void Run(CancellationToken token)
+        /// <param name="e">A <see cref="StartupEventArgs"/> that contains the event data.</param>
+        protected virtual void OnStartup(StartupEventArgs e)
        {
-            Dispatcher.UIThread.MainLoop(token);
-
-            // Make sure we call OnExit in case an error happened and Exit() wasn't called explicitly
-            if (!IsExiting)
-            {
-                OnExit?.Invoke(this, EventArgs.Empty);
-            }
+            Startup?.Invoke(this, e);
        }

        /// <summary>
-        /// Exits the application
+        /// Raises the <see cref="Exit"/> event.
        /// </summary>
-        public void Exit()
+        /// <param name="e">A <see cref="ExitEventArgs"/> that contains the event data.</param>
+        protected virtual void OnExit(ExitEventArgs e)
        {
-            IsExiting = true;
+            Exit?.Invoke(this, e);
+        }
+
+        /// <inheritdoc/>
+        public void Shutdown(int exitCode = 0)
+        {
+            if (IsShuttingDown)
+            {
+                throw new InvalidOperationException("Application is already shutting down.");
+            }
+
+            _exitCode = exitCode;
+
+            IsShuttingDown = true;         

            Windows.Clear();

-            OnExit?.Invoke(this, EventArgs.Empty);
+            try
+            {
+                var e = new ExitEventArgs { ApplicationExitCode = _exitCode };
+
+                OnExit(e);
+
+                _exitCode = e.ApplicationExitCode;                
+            }
+            finally
+            {
+                _mainLoopCancellationTokenSource?.Cancel();
+
+                _mainLoopCancellationTokenSource = null;
+
+                IsShuttingDown = false;

-            _mainLoopCancellationTokenSource?.Cancel();
+                Environment.ExitCode = _exitCode;
+            }
        }

        /// <inheritdoc/>
@ -302,20 +369,6 @@ namespace Avalonia
                   Styles.TryGetResource(key, out value);
        }

-        /// <summary>
-        /// Sent when the application is exiting.
-        /// </summary>
-        public event EventHandler OnExit;
-
-        /// <summary>
-        /// Called when the application is exiting.
-        /// </summary>
-        /// <param name="sender"></param>
-        /// <param name="e"></param>
-        protected virtual void OnExiting(object sender, EventArgs e)
-        {
-        }
-
        /// <summary>
        /// Register's the services needed by Avalonia.
        /// </summary>
--- a/src/Avalonia.Controls/ExitEventArgs.cs
+++ b/src/Avalonia.Controls/ExitEventArgs.cs
@ -0,0 +1,18 @@
+// Copyright (c) The Avalonia Project. All rights reserved.
+// Licensed under the MIT license. See licence.md file in the project root for full license information.
+
+using System;
+
+namespace Avalonia.Controls
+{
+    /// <summary>
+    /// Contains the arguments for the <see cref="IApplicationLifecycle.Exit"/> event.
+    /// </summary>
+    public class ExitEventArgs : EventArgs
+    {
+        /// <summary>
+        /// Gets or sets the exit code that an application returns to the operating system when the application exits.
+        /// </summary>
+        public int ApplicationExitCode { get; set; }
+    }
+}
--- a/src/Avalonia.Controls/IApplicationLifecycle.cs
+++ b/src/Avalonia.Controls/IApplicationLifecycle.cs
@ -7,14 +7,20 @@ namespace Avalonia.Controls
    /// </summary>
    public interface IApplicationLifecycle
    {
+        /// <summary>
+        /// Sent when the application is starting up.
+        /// </summary>
+        event EventHandler<StartupEventArgs> Startup;
+
        /// <summary>
        /// Sent when the application is exiting.
        /// </summary>
-        event EventHandler OnExit;
+        event EventHandler<ExitEventArgs> Exit;

        /// <summary>
-        /// Exits the application.
+        /// Shuts down the application and sets the exit code that is returned to the operating system when the application exits.
        /// </summary>
-        void Exit();
+        /// <param name="exitCode">An integer exit code for an application. The default exit code is 0.</param>
+        void Shutdown(int exitCode = 0);
    }
 }
--- a/src/Avalonia.Controls/ShutdownMode.cs
+++ b/src/Avalonia.Controls/ShutdownMode.cs
@ -1,26 +1,26 @@
 // Copyright (c) The Avalonia Project. All rights reserved.
 // Licensed under the MIT license. See licence.md file in the project root for full license information.

-namespace Avalonia
+namespace Avalonia.Controls
 {
    /// <summary>
-    /// Enum for ExitMode
+    /// Describes the possible values for <see cref="Application.ShutdownMode"/>.
    /// </summary>
-    public enum ExitMode
+    public enum ShutdownMode
    {
        /// <summary>
-        /// Indicates an implicit call to Application.Exit when the last window closes.
+        /// Indicates an implicit call to Application.Shutdown when the last window closes.
        /// </summary>
        OnLastWindowClose,

        /// <summary>
-        /// Indicates an implicit call to Application.Exit when the main window closes.
+        /// Indicates an implicit call to Application.Shutdown when the main window closes.
        /// </summary>
        OnMainWindowClose,

        /// <summary>
-        /// Indicates that the application only exits on an explicit call to Application.Exit.
+        /// Indicates that the application only exits on an explicit call to Application.Shutdown.
        /// </summary>
-        OnExplicitExit
+        OnExplicitShutdown
    }
-}
+}
--- a/src/Avalonia.Controls/StartupEventArgs.cs
+++ b/src/Avalonia.Controls/StartupEventArgs.cs
@ -0,0 +1,36 @@
+// Copyright (c) The Avalonia Project. All rights reserved.
+// Licensed under the MIT license. See licence.md file in the project root for full license information.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Avalonia.Controls
+{
+    /// <summary>
+    /// Contains the arguments for the <see cref="IApplicationLifecycle.Startup"/> event.
+    /// </summary>
+    public class StartupEventArgs : EventArgs
+    {
+        private string[] _args;
+
+        /// <summary>
+        /// Gets the command line arguments that were passed to the application.
+        /// </summary>
+        public IReadOnlyList<string> Args => _args ?? (_args = GetArgs());
+
+        private static string[] GetArgs()
+        {
+            try
+            {
+                var args = Environment.GetCommandLineArgs();
+
+                return args.Length > 1 ? args.Skip(1).ToArray() : new string[0];
+            }
+            catch (NotSupportedException)
+            {
+                return new string[0];
+            }
+        }
+    }
+}
--- a/src/Avalonia.Controls/TopLevel.cs
+++ b/src/Avalonia.Controls/TopLevel.cs
@ -127,7 +127,7 @@ namespace Avalonia.Controls

            if (_applicationLifecycle != null)
            {
-                _applicationLifecycle.OnExit += OnApplicationExiting;
+                _applicationLifecycle.Exit += OnApplicationExiting;
            }

            if (((IStyleHost)this).StylingParent is IResourceProvider applicationResources)
@ -281,7 +281,7 @@ namespace Avalonia.Controls
            Closed?.Invoke(this, EventArgs.Empty);
            Renderer?.Dispose();
            Renderer = null;
-            _applicationLifecycle.OnExit -= OnApplicationExiting;
+            _applicationLifecycle.Exit -= OnApplicationExiting;
        }

        /// <summary>
--- a/src/Avalonia.Controls/Window.cs
+++ b/src/Avalonia.Controls/Window.cs
@ -250,7 +250,7 @@ namespace Avalonia.Controls
        /// <summary>
        /// Fired before a window is closed.
        /// </summary>
-        public event EventHandler<CancelEventArgs> Closing;
+        public event EventHandler<CancelEventArgs> Closing;      

        private static void AddWindow(Window window)
        {
@ -440,7 +440,7 @@ namespace Avalonia.Controls
        /// </returns>
        public Task<TResult> ShowDialog<TResult>(IWindowImpl owner)
        {
-            if(owner == null)
+            if (owner == null)
                throw new ArgumentNullException(nameof(owner));

            if (IsVisible)
--- a/src/Avalonia.Controls/WindowCollection.cs
+++ b/src/Avalonia.Controls/WindowCollection.cs
@ -107,24 +107,24 @@ namespace Avalonia
                return;
            }

-            if (_application.IsExiting)
+            if (_application.IsShuttingDown)
            {
                return;
            }

-            switch (_application.ExitMode)
+            switch (_application.ShutdownMode)
            {
-                case ExitMode.OnLastWindowClose:
+                case ShutdownMode.OnLastWindowClose:
                    if (Count == 0)
                    {
-                        _application.Exit();
+                        _application.Shutdown();
                    }

                    break;
-                case ExitMode.OnMainWindowClose:
+                case ShutdownMode.OnMainWindowClose:
                    if (window == _application.MainWindow)
                    {
-                        _application.Exit();
+                        _application.Shutdown();
                    }

                    break;                   
--- a/tests/Avalonia.Animation.UnitTests/TransitionsTests.cs
+++ b/tests/Avalonia.Animation.UnitTests/TransitionsTests.cs
@ -0,0 +1,73 @@
+using System;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Avalonia.Animation;
+using Avalonia.Controls;
+using Avalonia.Styling;
+using Avalonia.UnitTests;
+using Avalonia.Data;
+using Xunit;
+using Avalonia.Animation.Easings;
+
+namespace Avalonia.Animation.UnitTests
+{
+    public class TransitionsTests
+    {
+        [Fact]
+        public void Check_Transitions_Interpolation_Negative_Bounds_Clamp()
+        {
+            var clock = new MockGlobalClock();
+
+            using (UnitTestApplication.Start(new TestServices(globalClock: clock)))
+            {
+                var border = new Border
+                {
+                    Transitions =
+                    {
+                        new DoubleTransition
+                        {
+                            Duration = TimeSpan.FromSeconds(1),
+                            Property = Border.OpacityProperty,
+                        }
+                    }
+                };
+
+                border.Opacity = 0;
+
+                clock.Pulse(TimeSpan.FromSeconds(0));
+                clock.Pulse(TimeSpan.FromSeconds(-0.5));
+
+                Assert.Equal(0, border.Opacity);
+            }
+        }
+
+        [Fact]
+        public void Check_Transitions_Interpolation_Positive_Bounds_Clamp()
+        {
+            var clock = new MockGlobalClock();
+
+            using (UnitTestApplication.Start(new TestServices(globalClock: clock)))
+            {
+                var border = new Border
+                {
+                    Transitions =
+                    {
+                        new DoubleTransition
+                        {
+                            Duration = TimeSpan.FromSeconds(1),
+                            Property = Border.OpacityProperty,
+                        }
+                    }
+                };
+
+                border.Opacity = 0;
+
+                clock.Pulse(TimeSpan.FromSeconds(0));
+                clock.Pulse(TimeSpan.FromMilliseconds(1001));
+
+                Assert.Equal(0, border.Opacity);
+            }
+        }
+    }
+}
--- a/tests/Avalonia.Controls.UnitTests/ApplicationTests.cs
+++ b/tests/Avalonia.Controls.UnitTests/ApplicationTests.cs
@ -3,6 +3,7 @@

 using System;
 using System.Collections.Generic;
+using Avalonia.Threading;
 using Avalonia.UnitTests;
 using Xunit;

@ -15,7 +16,11 @@ namespace Avalonia.Controls.UnitTests
        {
            using (UnitTestApplication.Start(TestServices.StyledWindow))
            {
-                Application.Current.ExitMode = ExitMode.OnMainWindowClose;
+                Application.Current.ShutdownMode = ShutdownMode.OnMainWindowClose;
+
+                var hasExit = false;
+
+                Application.Current.Exit += (s, e) => hasExit = true;

                var mainWindow = new Window();

@ -29,7 +34,7 @@ namespace Avalonia.Controls.UnitTests

                mainWindow.Close();

-                Assert.True(Application.Current.IsExiting);
+                Assert.True(hasExit);
            }
        }

@ -38,7 +43,11 @@ namespace Avalonia.Controls.UnitTests
        {
            using (UnitTestApplication.Start(TestServices.StyledWindow))
            {
-                Application.Current.ExitMode = ExitMode.OnLastWindowClose;
+                Application.Current.ShutdownMode = ShutdownMode.OnLastWindowClose;
+
+                var hasExit = false;
+
+                Application.Current.Exit += (s, e) => hasExit = true;

                var windowA = new Window();

@ -50,11 +59,11 @@ namespace Avalonia.Controls.UnitTests

                windowA.Close();

-                Assert.False(Application.Current.IsExiting);
+                Assert.False(hasExit);

                windowB.Close();

-                Assert.True(Application.Current.IsExiting);
+                Assert.True(hasExit);
            }
        }

@ -63,7 +72,11 @@ namespace Avalonia.Controls.UnitTests
        {
            using (UnitTestApplication.Start(TestServices.StyledWindow))
            {
-                Application.Current.ExitMode = ExitMode.OnExplicitExit;
+                Application.Current.ShutdownMode = ShutdownMode.OnExplicitShutdown;
+
+                var hasExit = false;
+
+                Application.Current.Exit += (s, e) => hasExit = true;

                var windowA = new Window();

@ -75,15 +88,15 @@ namespace Avalonia.Controls.UnitTests

                windowA.Close();

-                Assert.False(Application.Current.IsExiting);
+                Assert.False(hasExit);

                windowB.Close();

-                Assert.False(Application.Current.IsExiting);
+                Assert.False(hasExit);

-                Application.Current.Exit();
+                Application.Current.Shutdown();

-                Assert.True(Application.Current.IsExiting);
+                Assert.True(hasExit);
            }
        }

@ -99,7 +112,7 @@ namespace Avalonia.Controls.UnitTests
                    window.Show();
                }

-                Application.Current.Exit();
+                Application.Current.Shutdown();

                Assert.Empty(Application.Current.Windows);
            }
@ -129,5 +142,18 @@ namespace Avalonia.Controls.UnitTests
                Assert.True(raised);
            }
        }
+
+        [Fact]
+        public void Should_Set_ExitCode_After_Shutdown()
+        {
+            using (UnitTestApplication.Start(TestServices.MockThreadingInterface))
+            {
+                Application.Current.Shutdown(1337);
+
+                var exitCode = Application.Current.Run();
+
+                Assert.Equal(1337, exitCode);
+            }
+        }
    }
 }
--- a/tests/Avalonia.Controls.UnitTests/TopLevelTests.cs
+++ b/tests/Avalonia.Controls.UnitTests/TopLevelTests.cs
@ -215,7 +215,7 @@ namespace Avalonia.Controls.UnitTests
                var impl = new Mock<ITopLevelImpl>();
                impl.SetupAllProperties();
                var target = new TestTopLevel(impl.Object);
-                UnitTestApplication.Current.Exit();
+                UnitTestApplication.Current.Shutdown();
                Assert.True(target.IsClosed);
            }
        }
--- a/tests/Avalonia.LeakTests/TransitionTests.cs
+++ b/tests/Avalonia.LeakTests/TransitionTests.cs
@ -0,0 +1,60 @@
+using System;
+using Avalonia.Animation;
+using Avalonia.Controls;
+using Avalonia.UnitTests;
+using JetBrains.dotMemoryUnit;
+using Xunit;
+using Xunit.Abstractions;
+
+namespace Avalonia.LeakTests
+{
+    [DotMemoryUnit(FailIfRunWithoutSupport = false)]
+    public class TransitionTests
+    {
+        public TransitionTests(ITestOutputHelper atr)
+        {
+            DotMemoryUnitTestOutput.SetOutputMethod(atr.WriteLine);
+        }
+
+        [Fact(Skip = "TODO: Fix this leak")]
+        public void Transition_On_StyledProperty_Is_Freed()
+        {
+            var clock = new MockGlobalClock();
+
+            using (UnitTestApplication.Start(new TestServices(globalClock: clock)))
+            {
+                Func<Border> run = () =>
+                {
+                    var border = new Border
+                    {
+                        Transitions =
+                        {
+                            new DoubleTransition
+                            {
+                                Duration = TimeSpan.FromSeconds(1),
+                                Property = Border.OpacityProperty,
+                            }
+                        }
+                    };
+
+                    border.Opacity = 0;
+
+                    clock.Pulse(TimeSpan.FromSeconds(0));
+                    clock.Pulse(TimeSpan.FromSeconds(0.5));
+
+                    Assert.Equal(0.5, border.Opacity);
+
+                    clock.Pulse(TimeSpan.FromSeconds(1));
+
+                    Assert.Equal(0, border.Opacity);
+                    return border;
+                };
+
+                var result = run();
+
+                dotMemory.Check(memory =>
+                    Assert.Equal(0, memory.GetObjects(where => where.Type.Is<TransitionInstance>()).ObjectsCount));
+            }
+        }
+    }
+}
--- a/tests/Avalonia.UnitTests/MockGlobalClock.cs
+++ b/tests/Avalonia.UnitTests/MockGlobalClock.cs
@ -0,0 +1,10 @@
+using System;
+using Avalonia.Animation;
+
+namespace Avalonia.UnitTests
+{
+    public class MockGlobalClock : ClockBase, IGlobalClock
+    {
+        public new void Pulse(TimeSpan systemTime) => base.Pulse(systemTime);
+    }
+}
--- a/tests/Avalonia.UnitTests/TestServices.cs
+++ b/tests/Avalonia.UnitTests/TestServices.cs
@ -16,6 +16,7 @@ using System.Reactive.Concurrency;
 using System.Collections.Generic;
 using Avalonia.Controls;
 using System.Reflection;
+using Avalonia.Animation;

 namespace Avalonia.UnitTests
 {
@ -58,6 +59,7 @@ namespace Avalonia.UnitTests
        public TestServices(
            IAssetLoader assetLoader = null,
            IFocusManager focusManager = null,
+            IGlobalClock globalClock = null,
            IInputManager inputManager = null,
            Func<IKeyboardDevice> keyboardDevice = null,
            IKeyboardNavigationHandler keyboardNavigation = null,
@ -75,6 +77,7 @@ namespace Avalonia.UnitTests
        {
            AssetLoader = assetLoader;
            FocusManager = focusManager;
+            GlobalClock = globalClock;
            InputManager = inputManager;
            KeyboardDevice = keyboardDevice;
            KeyboardNavigation = keyboardNavigation;
@ -93,6 +96,7 @@ namespace Avalonia.UnitTests
        public IAssetLoader AssetLoader { get; }
        public IInputManager InputManager { get; }
        public IFocusManager FocusManager { get; }
+        public IGlobalClock GlobalClock { get; }
        public Func<IKeyboardDevice> KeyboardDevice { get; }
        public IKeyboardNavigationHandler KeyboardNavigation { get; }
        public Func<IMouseDevice> MouseDevice { get; }
@ -109,6 +113,7 @@ namespace Avalonia.UnitTests
        public TestServices With(
            IAssetLoader assetLoader = null,
            IFocusManager focusManager = null,
+            IGlobalClock globalClock = null,
            IInputManager inputManager = null,
            Func<IKeyboardDevice> keyboardDevice = null,
            IKeyboardNavigationHandler keyboardNavigation = null,
@ -127,6 +132,7 @@ namespace Avalonia.UnitTests
            return new TestServices(
                assetLoader: assetLoader ?? AssetLoader,
                focusManager: focusManager ?? FocusManager,
+                globalClock: globalClock ?? GlobalClock,
                inputManager: inputManager ?? InputManager,
                keyboardDevice: keyboardDevice ?? KeyboardDevice,
                keyboardNavigation: keyboardNavigation ?? KeyboardNavigation,
--- a/tests/Avalonia.UnitTests/UnitTestApplication.cs
+++ b/tests/Avalonia.UnitTests/UnitTestApplication.cs
@ -12,6 +12,7 @@ using Avalonia.Threading;
 using System.Reactive.Disposables;
 using System.Reactive.Concurrency;
 using Avalonia.Input.Platform;
+using Avalonia.Animation;

 namespace Avalonia.UnitTests
 {
@ -52,6 +53,7 @@ namespace Avalonia.UnitTests
            AvaloniaLocator.CurrentMutable
                .Bind<IAssetLoader>().ToConstant(Services.AssetLoader)
                .Bind<IFocusManager>().ToConstant(Services.FocusManager)
+                .Bind<IGlobalClock>().ToConstant(Services.GlobalClock)
                .BindToSelf<IGlobalStyles>(this)
                .Bind<IInputManager>().ToConstant(Services.InputManager)
                .Bind<IKeyboardDevice>().ToConstant(Services.KeyboardDevice?.Invoke())