From 82e6a42b977e5e9c555b221c4ba8fb436bf204eb Mon Sep 17 00:00:00 2001
From: Daniel Grunwald <daniel@danielgrunwald.de>
Date: Tue, 13 Oct 2009 16:28:40 +0000
Subject: [PATCH] Fixed bug in TextView.BackgroundRenderer_Added that could
 cause a VisualLinesInvalidException during rendering.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@5066 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61
---
 .../Rendering/TextView.cs                      | 18 +++++-------------
 1 file changed, 5 insertions(+), 13 deletions(-)

diff --git a/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Rendering/TextView.cs b/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Rendering/TextView.cs
index 672c62c647..e6041b6dba 100644
--- a/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Rendering/TextView.cs
+++ b/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Rendering/TextView.cs
@@ -119,7 +119,7 @@ namespace ICSharpCode.AvalonEdit.Rendering
 				DocumentChanged(this, EventArgs.Empty);
 		}
 		
-		/// <inheritdoc/>
+		/// <inheritdoc cref="IWeakEventListener.ReceiveWeakEvent"/>
 		protected virtual bool ReceiveWeakEvent(Type managerType, object sender, EventArgs e)
 		{
 			if (managerType == typeof(TextDocumentWeakEventManager.Changing)) {
@@ -800,6 +800,8 @@ namespace ICSharpCode.AvalonEdit.Rendering
 		/// </summary>
 		protected override Size ArrangeOverride(Size finalSize)
 		{
+			if (!VisualLinesValid)
+				throw new VisualLinesInvalidException();
 			foreach (UIElement layer in layers) {
 				layer.Arrange(new Rect(new Point(0, 0), finalSize));
 			}
@@ -859,23 +861,13 @@ namespace ICSharpCode.AvalonEdit.Rendering
 		void BackgroundRenderer_Added(IBackgroundRenderer renderer)
 		{
 			ConnectToTextView(renderer);
-			InvalidateVisualAndLayerVisuals();
+			InvalidateLayer(renderer.Layer);
 		}
 		
 		void BackgroundRenderer_Removed(IBackgroundRenderer renderer)
 		{
 			DisconnectFromTextView(renderer);
-			InvalidateVisualAndLayerVisuals();
-		}
-		
-		void InvalidateVisualAndLayerVisuals()
-		{
-			InvalidateVisual();
-			foreach (UIElement layer in this.Layers) {
-				// invalidate known layers
-				if (layer is Layer)
-					layer.InvalidateVisual();
-			}
+			InvalidateLayer(renderer.Layer);
 		}
 		
 		/// <inheritdoc/>