Fixed ObjectDisposedException generated when running XSL transform after splitting the XSLT Output window. The TextAreaControl/TextArea classes were not removing document event handlers when disposed.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@653 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Libraries/ICSharpCode.TextEditor/Project/Src/Gui/TextArea.cs

@@ -56,6 +56,8 @@ namespace ICSharpCode.TextEditor
 		SelectionManager selectionManager;
 		Caret            caret;
 		
+		bool disposed;
+		
 		public TextEditorControl MotherTextEditorControl {
 			get {
 				return motherTextEditorControl;
@@ -727,12 +729,17 @@ namespace ICSharpCode.TextEditor
 //			++Caret.DesiredColumn;
 		}
 		
-		
 		protected override void Dispose(bool disposing)
 		{
 			base.Dispose(disposing);
 			if (disposing) {
-				Caret.Dispose();
+				if (!disposed) {
+					disposed = true;
+					caret.PositionChanged -= new EventHandler(SearchMatchingBracket);
+					Document.TextContentChanged -= new EventHandler(TextContentChanged);
+					Document.FoldingManager.FoldingsChanged -= new EventHandler(DocumentFoldingsChanged);
+					caret.Dispose();
+				}
 			}
 		}
 		

src/Libraries/ICSharpCode.TextEditor/Project/Src/Gui/TextAreaControl.cs

@@ -39,6 +39,7 @@ namespace ICSharpCode.TextEditor
 		HScrollBar hScrollBar = new HScrollBar();
 		TextArea   textArea;
 		bool       doHandleMousewheel = true;
+		bool       disposed;
 		
 		public TextArea TextArea {
 			get {
@@ -110,6 +111,17 @@ namespace ICSharpCode.TextEditor
 			SetStyle(ControlStyles.Selectable, true);
 		}
 		
+		protected override void Dispose(bool disposing)
+		{
+			if (disposing) {
+				if (!disposed) {
+					disposed = true;
+					Document.DocumentChanged -= new DocumentEventHandler(AdjustScrollBars);
+				}
+			}
+			base.Dispose(disposing);
+		}
+		
 		protected override void OnResize(System.EventArgs e)
 		{
 			base.OnResize(e);