fix http://bugtracker.sharpdevelop.net/issue/ViewIssue.aspx?id=1783&PROJID=4

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/AvalonEditViewContent.cs

@@ -139,10 +139,6 @@ namespace ICSharpCode.AvalonEdit.AddIn
 				codeEditor.SyntaxHighlighting =
 					HighlightingManager.Instance.GetDefinitionByExtension(Path.GetExtension(file.FileName));
 				
-				if (!file.IsUntitled) {
-					codeEditor.PrimaryTextEditor.IsReadOnly = (File.GetAttributes(file.FileName) & FileAttributes.ReadOnly) == FileAttributes.ReadOnly;
-				}
-				
 				codeEditor.Load(stream);
 				// Load() causes the undo stack to think stuff changed, so re-mark the file as original if necessary
 				if (!this.PrimaryFile.IsDirty) {

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/CodeEditorView.cs

@@ -84,6 +84,21 @@ namespace ICSharpCode.AvalonEdit.AddIn
 			get { return this.Adapter.FileName; }
 		}
 		
+		public new bool IsReadOnly {
+			get {
+				if (!File.Exists(FileName))
+					return base.IsReadOnly;
+				
+				if ((File.GetAttributes(FileName) & FileAttributes.ReadOnly) == FileAttributes.ReadOnly)
+					return true;
+				
+				return base.IsReadOnly;
+			}
+			set {
+				base.IsReadOnly = value;
+			}
+		}
+		
 		protected override void OnOptionChanged(PropertyChangedEventArgs e)
 		{
 			base.OnOptionChanged(e);

src/Main/Base/Project/Src/Gui/IWorkbenchWindow.cs

@@ -72,6 +72,11 @@ namespace ICSharpCode.SharpDevelop.Gui
 		/// </summary>
 		void SelectWindow();
 		
+		/// <summary>
+		/// Refresh window status: title, infotip, lock.
+		/// </summary>
+		void RefreshStatus();
+		
 		/// <summary>
 		/// Is called when the title of this window has changed.
 		/// </summary>

src/Main/Base/Project/Src/Gui/Workbench/Layouts/AvalonWorkbenchWindow.cs

@@ -267,6 +267,11 @@ namespace ICSharpCode.SharpDevelop.Gui
 			Activate();//this.SetAsActive();
 		}
 		
+		public void RefreshStatus()
+		{
+			UpdateActiveViewContent();
+		}
+		
 		public override void OnApplyTemplate()
 		{
 			base.OnApplyTemplate();

src/Main/Base/Project/Src/Services/File/FileChangeWatcher.cs

@@ -137,6 +137,7 @@ namespace ICSharpCode.SharpDevelop
 				watcher.Path = Path.GetDirectoryName(fileName);
 				watcher.Filter = Path.GetFileName(fileName);
 				watcher.EnableRaisingEvents = true;
+				watcher.NotifyFilter |= NotifyFilters.Attributes;
 			} catch (PlatformNotSupportedException) {
 				if (watcher != null) {
 					watcher.Dispose();
@@ -173,6 +174,8 @@ namespace ICSharpCode.SharpDevelop
 						delegate { MainForm_Activated(this, EventArgs.Empty); } );
 				}
 			}
+			
+			file.RegisteredViewContents.ForEach(vc => vc.WorkbenchWindow.RefreshStatus());
 		}
 		
 		void MainForm_Activated(object sender, EventArgs e)