Cleanup

samples/Sandbox/MainWindow.axaml

@@ -1,9 +1,5 @@
 <Window xmlns="https://github.com/avaloniaui"
         xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
         x:Class="Sandbox.MainWindow">
-  <StackPanel>
-    <TextBox x:Name="txtBox" />
-    <TextPresenter Text="Hello World" PreeditText="{Binding #txtBox.Text}" CaretIndex="11"/>
-  </StackPanel>
- 
+    <TextBox />
 </Window>

src/Windows/Avalonia.Win32/WindowImpl.AppWndProc.cs

@@ -674,7 +674,6 @@ namespace Avalonia.Win32
                 case WindowsMessage.WM_IME_STARTCOMPOSITION:
                     Imm32InputMethod.Current.IsComposing = true;
                     return IntPtr.Zero;
-                    break;
                 case WindowsMessage.WM_IME_ENDCOMPOSITION:
                     Imm32InputMethod.Current.IsComposing = false;
                     break;