Fixed a crashing bug Stippi's StressTest revealed: hidden (and especially,

removed and deleted) windows must not be the mouse event window (ie. while
dragging or resizing the window).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16749 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/servers/app/Desktop.cpp

@@ -1270,6 +1270,8 @@ Desktop::HideWindow(WindowLayer* window)
 		return;
 
 	window->SetHidden(true);
+	if (fMouseEventWindow == window)
+		fMouseEventWindow = NULL;
 
 	if (window->InWorkspace(fCurrentWorkspace)) {
 		_UpdateSubsetWorkspaces(window);