Merge pull request #2182 from jeffreye/fixes/osx-start-minimized

Fix start minimized bug

native/Avalonia.Native/src/OSX/window.mm

@@ -425,7 +425,7 @@ private:
                 [[Window parentWindow] removeChildWindow:Window];
             WindowBaseImpl::Show();
             
-            return SetWindowState(_lastWindowState);
+            return SetWindowState(Normal);
         }
     }
     
@@ -1184,6 +1184,25 @@ NSArray* AllLoopModes = [NSArray arrayWithObjects: NSDefaultRunLoopMode, NSEvent
     }
 }
 
+- (void)windowDidMiniaturize:(NSNotification *)notification
+{
+    auto parent = dynamic_cast<IWindowStateChanged*>(_parent.operator->());
+    
+    if(parent != nullptr)
+    {
+        parent->WindowStateChanged();
+    }
+}
+
+- (void)windowDidDeminiaturize:(NSNotification *)notification
+{
+    auto parent = dynamic_cast<IWindowStateChanged*>(_parent.operator->());
+    
+    if(parent != nullptr)
+    {
+        parent->WindowStateChanged();
+    }
+}
 
 - (BOOL)windowShouldZoom:(NSWindow *)window toFrame:(NSRect)newFrame
 {

src/Avalonia.Native/PlatformThreadingInterface.cs

@@ -68,8 +68,6 @@ namespace Avalonia.Native
                     lock (l)
                     {
                         cancellation?.Cancel();
-                        cancellation?.Dispose();
-                        cancellation = null;
                     }
                 });
                 try