Fix SD2-1638: Unable to re-open SharpDevelop's window under Vista after minimizing

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/3.0@5731 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Main/Base/Project/Src/TextEditor/ClipboardHandling.cs

@@ -5,11 +5,14 @@
 //     <version>$Revision$</version>
 // </file>
 
-using ICSharpCode.SharpDevelop.Util;
 using System;
+using System.Runtime.InteropServices;
 using System.Threading;
+
 using ICSharpCode.Core.WinForms;
 using ICSharpCode.SharpDevelop.Gui;
+using ICSharpCode.SharpDevelop.Util;
+using Microsoft.Win32.SafeHandles;
 
 namespace ICSharpCode.SharpDevelop.DefaultEditor
 {
@@ -65,9 +68,16 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor
 			}
 			currentWorker = workerThread.Enqueue(DoUpdate);
 			// wait a few ms in case the clipboard can be accessed without problems
-			currentWorker.AsyncWaitHandle.WaitOne(50);
+			WaitForSingleObject(currentWorker.AsyncWaitHandle.SafeWaitHandle, 50);
+			// Using WaitHandle.WaitOne() pumps some Win32 messages.
+			// To avoid unintended reentrancy, we need to avoid pumping messages,
+			// so we directly call the Win32 WaitForSingleObject function.
+			// See SD2-1638 for details.
 		}
 		
+		[DllImport("kernel32", SetLastError=true, ExactSpelling=true)]
+		static extern Int32 WaitForSingleObject(SafeWaitHandle handle, Int32 milliseconds);
+		
 		static void DoUpdate()
 		{
 			clipboardContainsText = ClipboardWrapper.ContainsText;