Merge pull request #2766 from comintern/next

Fix extreme UI sluggishness, avoid throws in SubclassingWindow.

Author: comintern

RetailCoder.VBE/UI/SelectionChangeService.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Linq;
+using System.Threading.Tasks;
 using Rubberduck.Parsing;
 using Rubberduck.Parsing.Symbols;
 using Rubberduck.VBEditor.Events;
@@ -39,8 +40,11 @@ private void OnVbeSelectionChanged(object sender, SelectionChangedEventArgs e)
                 return;
             }
 
-            var eventArgs = new DeclarationChangedEventArgs(e.CodePane, _parser.State.FindSelectedDeclaration(e.CodePane));
-            DispatchSelectedDeclaration(eventArgs);                       
+            new Task(() =>
+            {
+                var eventArgs = new DeclarationChangedEventArgs(e.CodePane, _parser.State.FindSelectedDeclaration(e.CodePane));
+                DispatchSelectedDeclaration(eventArgs);
+            }).Start();
         }
 
         private void OnVbeFocusChanged(object sender, WindowChangedEventArgs e)
@@ -55,21 +59,21 @@ private void OnVbeFocusChanged(object sender, WindowChangedEventArgs e)
                         {
                             return;
                         }
-                        DispatchSelectedDesignerDeclaration(_vbe.SelectedVBComponent);                        
+                        new Task(() => DispatchSelectedDesignerDeclaration(_vbe.SelectedVBComponent)).Start();                  
                         break;
                     case WindowKind.CodeWindow:
                         //Caret changed in a code pane.
                         if (e.CodePane != null && !e.CodePane.IsWrappingNullReference)
                         {
-                            DispatchSelectedDeclaration(new DeclarationChangedEventArgs(e.CodePane, _parser.State.FindSelectedDeclaration(e.CodePane)));
+                            new Task(() => DispatchSelectedDeclaration(new DeclarationChangedEventArgs(e.CodePane, _parser.State.FindSelectedDeclaration(e.CodePane)))).Start(); 
                         }
                         break;
                 }
             }
             else if (e.EventType == FocusType.ChildFocus)
             {
                 //Treeview selection changed in project window.
-                DispatchSelectedProjectNodeDeclaration(_vbe.SelectedVBComponent);
+                new Task(() => DispatchSelectedProjectNodeDeclaration(_vbe.SelectedVBComponent)).Start();
             }
         }
 

Rubberduck.VBEEditor/WindowsApi/SubclassingWindow.cs

@@ -43,7 +43,7 @@ protected SubclassingWindow(IntPtr subclassId, IntPtr hWnd)
         public void Dispose()
         {
             ReleaseHandle();
-            //GC.SuppressFinalize(this);
+            _thisHandle.Free();
         }
 
         private void AssignHandle()
@@ -86,14 +86,13 @@ public virtual int SubClassProc(IntPtr hWnd, IntPtr msg, IntPtr wParam, IntPtr l
         {
             if (!_listening)
             {
-                throw new Exception("State corrupted. Received window message while not listening.");
+                Debug.WriteLine("State corrupted. Received window message while not listening.");
+                return DefSubclassProc(hWnd, msg, wParam, lParam);
             }
 
-            Debug.Assert(IsWindow(_hwnd));
             if ((uint)msg == (uint)WM.RUBBERDUCK_SINKING || (uint)msg == (uint)WM.DESTROY)
             {                
-                ReleaseHandle();
-                _thisHandle.Free();
+                ReleaseHandle();                
             }
             return DefSubclassProc(hWnd, msg, wParam, lParam);
         }