Fixed bug: Starting IDE Multiple Times looses Panel layout (based on patch by Scott Ferrett)

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/2.0@1424 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Main/Base/Project/Src/Gui/Pads/DefinitionViewPad.cs

@@ -63,7 +63,7 @@ namespace ICSharpCode.SharpDevelop.Gui
 			if (res == null) return;
 			FilePosition pos = res.GetDefinitionPosition();
 			if (pos == null) return;
-			ctl.Invoke(new OpenFileDelegate(OpenFile), pos);
+			WorkbenchSingleton.SafeThreadAsyncCall(new OpenFileDelegate(OpenFile), pos);
 		}
 		
 		ResolveResult ResolveAtCaret(ParserUpdateStepEventArgs e)

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

@@ -127,14 +127,14 @@ namespace ICSharpCode.SharpDevelop.Gui
 					case "HideToolbars":
 						RedrawToolbars();
 						break;
-					//case "HideTabs":
-					//case "HideVerticalScrollbar":
-					//case "HideHorizontalScrollbar":
+						//case "HideTabs":
+						//case "HideVerticalScrollbar":
+						//case "HideHorizontalScrollbar":
 					case "HideStatusBar":
 					case "ShowStatusBarOnMouseMove":
 						RedrawStatusBar();
 						break;
-					//case "HideWindowsTaskbar":
+						//case "HideWindowsTaskbar":
 				}
 			}
 		}
@@ -163,7 +163,7 @@ namespace ICSharpCode.SharpDevelop.Gui
 		{
 			try {
 				if (File.Exists(LayoutConfiguration.CurrentLayoutFileName)) {
-					dockPanel.LoadFromXml(LayoutConfiguration.CurrentLayoutFileName, new DeserializeDockContent(GetContent));
+					LoadDockPanelLayout(LayoutConfiguration.CurrentLayoutFileName);
 				} else {
 					LoadDefaultLayoutConfiguration();
 				}
@@ -175,7 +175,17 @@ namespace ICSharpCode.SharpDevelop.Gui
 		void LoadDefaultLayoutConfiguration()
 		{
 			if (File.Exists(LayoutConfiguration.CurrentLayoutTemplateFileName)) {
-				dockPanel.LoadFromXml(LayoutConfiguration.CurrentLayoutTemplateFileName, new DeserializeDockContent(GetContent));
+				LoadDockPanelLayout(LayoutConfiguration.CurrentLayoutTemplateFileName);
+			}
+		}
+		
+		void LoadDockPanelLayout(string fileName)
+		{
+			// LoadFromXml(fileName, ...) locks the file against simultanous read access
+			// -> we would loose the layout when starting two SharpDevelop instances
+			//    at the same time => open stream with shared read access.
+			using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read)) {
+				dockPanel.LoadFromXml(fs, new DeserializeDockContent(GetContent));
 			}
 		}