#1904: Cherry-picked SharpTreeView changes from SharpDevelop repository.

7edf1c4f1 fix focusing bug in SharpTreeView
60b89bb14 Changed behavior for 'Key.Space' in SharpTreeView.cs, instead of 'double click', now it sets 'IsChecked'.
103aff080 Set e.Handled = true in SharpTreeView.OnKeyDown()
c928f88b5 Fix F2/Escape for editable SharpTreeNodes.
6b01d6f55 Fix #354: "+" icon in SharpTreeView is missing right border in 120DPI mode

SharpTreeView/SharpTreeNode.cs

@@ -335,19 +335,14 @@ namespace ICSharpCode.TreeView
 		
 		public IEnumerable<SharpTreeNode> Ancestors()
 		{
-			var node = this;
-			while (node.Parent != null) {
-				yield return node.Parent;
-				node = node.Parent;
-			}
+			for (SharpTreeNode n = this.Parent; n != null; n = n.Parent)
+				yield return n;
 		}
 		
 		public IEnumerable<SharpTreeNode> AncestorsAndSelf()
 		{
-			yield return this;
-			foreach (var node in Ancestors()) {
-				yield return node;
-			}
+			for (SharpTreeNode n = this; n != null; n = n.Parent)
+				yield return n;
 		}
 		
 		#endregion

SharpTreeView/SharpTreeNodeView.cs

@@ -147,7 +147,7 @@ namespace ICSharpCode.TreeView
 				result -= 19;
 			}
 			if (result < 0) {
-				Debug.WriteLine("SharpTreeNodeView.CalculateIndent() on node without correctly-set level");
+				Debug.WriteLine("Negative indent level detected for node " + Node);
 				return 0;
 			}
 			return result;

SharpTreeView/SharpTreeView.cs

@@ -178,7 +178,7 @@ namespace ICSharpCode.TreeView
 		{
 			if (updatesLocked) return;
 			SetSelectedItems(newSelection ?? Enumerable.Empty<SharpTreeNode>());
-			if (SelectedItem == null) {
+			if (SelectedItem == null && this.IsKeyboardFocusWithin) {
 				// if we removed all selected nodes, then move the focus to the node 
 				// preceding the first of the old selected nodes
 				SelectedIndex = topSelectedIndex;
@@ -265,11 +265,24 @@ namespace ICSharpCode.TreeView
 					}
 					break;
 				case Key.Return:
-				case Key.Space:
 					if (container != null && Keyboard.Modifiers == ModifierKeys.None && this.SelectedItems.Count == 1 && this.SelectedItem == container.Node) {
+						e.Handled = true;
 						container.Node.ActivateItem(e);
 					}
 					break;
+				case Key.Space:
+					if (container != null && Keyboard.Modifiers == ModifierKeys.None && this.SelectedItems.Count == 1 && this.SelectedItem == container.Node) {
+						e.Handled = true;
+						if (container.Node.IsCheckable) {
+							if (container.Node.IsChecked == null) // If partially selected, we want to select everything
+								container.Node.IsChecked = true;
+							else
+								container.Node.IsChecked = !container.Node.IsChecked;
+						} else {
+							container.Node.ActivateItem(e);
+						}
+					}
+					break;
 				case Key.Add:
 					if (container != null && ItemsControl.ItemsControlFromItemContainer(container) == this) {
 						container.Node.IsExpanded = true;

SharpTreeView/SharpTreeViewItem.cs

@@ -29,13 +29,16 @@ namespace ICSharpCode.TreeView
 		{
 			switch (e.Key) {
 				case Key.F2:
-//					if (SharpTreeNode.ActiveNodes.Count == 1 && Node.IsEditable) {
-//						Node.IsEditing = true;
-//						e.Handled = true;
-//					}
+					if (Node.IsEditable && ParentTreeView != null && ParentTreeView.SelectedItems.Count == 1 && ParentTreeView.SelectedItems[0] == Node) {
+						Node.IsEditing = true;
+						e.Handled = true;
+					}
 					break;
 				case Key.Escape:
-					Node.IsEditing = false;
+					if (Node.IsEditing) {
+						Node.IsEditing = false;
+						e.Handled = true;
+					}
 					break;
 			}
 		}

SharpTreeView/Themes/Generic.xaml

@@ -237,7 +237,7 @@
                                           Style="{StaticResource ExpandCollapseToggleStyle}"
                                           IsChecked="{Binding IsExpanded}"
                                           Visibility="Hidden"
-                                          Margin="0 0 6 0"
+                                          Margin="0 0 7 0"
                                           VerticalAlignment="Center" />
                             <Border Name="checkBoxContainer"
                                     Width="16"