Fix #3281: Help -> About is broken

ILSpy/AssemblyTree/AssemblyTreeModel.cs

@@ -502,11 +502,7 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 			}
 		}
 
-		internal void SelectNodes(IEnumerable<SharpTreeNode> nodes, bool ignoreCompilationRequests = false)
-		{
-			this.ignoreDecompilationRequests = ignoreCompilationRequests;
-
-			try
+		internal void SelectNodes(IEnumerable<SharpTreeNode> nodes)
 		{
 			// Ensure nodes exist
 			var nodesList = nodes.Select(n => FindNodeByPath(GetPathForNode(n), true))
@@ -527,12 +523,6 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 			SelectedItems.Clear();
 			SelectedItems.AddRange(nodesList);
 		}
-			finally
-			{
-				this.ignoreDecompilationRequests = false;
-			}
-
-		}
 
 		/// <summary>
 		/// Retrieves a node using the .ToString() representations of its ancestors.
@@ -699,6 +689,8 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 		#region Decompile (TreeView_SelectionChanged)
 
 		void TreeView_SelectionChanged()
+		{
+			if (SelectedItems.Count > 0)
 			{
 				var delayDecompilationRequestDueToContextMenu = Mouse.RightButton == MouseButtonState.Pressed;
 
@@ -710,6 +702,7 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 				{
 					ContextMenuProvider.ContextMenuClosed += ContextMenuClosed;
 				}
+			}
 
 			MessageBus.Send(this, new AssemblyTreeSelectionChangedEventArgs());
 
@@ -728,13 +721,8 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 			}
 		}
 
-		private bool ignoreDecompilationRequests;
-
 		public void DecompileSelectedNodes(DecompilerTextViewState newState = null, bool recordHistory = true)
 		{
-			if (ignoreDecompilationRequests)
-				return;
-
 			var activeTabPage = DockWorkspace.Instance.ActiveTabPage;
 
 			if (recordHistory)
@@ -790,7 +778,7 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 
 			DockWorkspace.Instance.ActiveTabPage = newState.TabPage;
 
-			SelectNodes(newState.TreeNodes, ignoreCompilationRequests: true);
+			SelectNodes(newState.TreeNodes);
 			DecompileSelectedNodes(newState.ViewState as DecompilerTextViewState, false);
 		}
 
@@ -845,7 +833,7 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 				if (currentState != null)
 					history.UpdateCurrent(new NavigationState(tabPage, currentState));
 
-				UnselectAll(ignoreCompilationRequests: true);
+				UnselectAll();
 
 				history.Record(new NavigationState(tabPage, new ViewState { ViewedUri = e.Uri }));
 			}
@@ -861,11 +849,9 @@ namespace ICSharpCode.ILSpy.AssemblyTree
 			}
 		}
 
-		public void UnselectAll(bool ignoreCompilationRequests = false)
+		private void UnselectAll()
 		{
-			this.ignoreDecompilationRequests = ignoreCompilationRequests;
 			SelectedItems.Clear();
-			this.ignoreDecompilationRequests = false;
 		}
 
 		public IEnumerable<SharpTreeNode> GetTopLevelSelection()