Use a flag in BWindow to store whether an update to a view (Invalidate()) has

been requested. The first call to a BView::Invalidate() will flush the link
so that app_server is notified as soon as possible. It makes no sense for
further calls to Invalidate() to flush also, since Flush() is not cheap. This
trick makes Invalidate() about 3.2 times faster, making it a cheaper operation.
I could not see any negative effects, I tested with apps that invalidate
multiple different parts inside a window in reaction to something. Thanks go to
Ingo who had the idea.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26020 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/interface/Window.cpp

@@ -1245,6 +1245,7 @@ FrameMoved(origin);
 			fLink->StartMessage(AS_END_UPDATE);
 			fLink->Flush();
 			fInTransaction = false;
+			fUpdateRequested = false;
 
 //printf("BWindow(%s) - UPDATE took %lld usecs\n", Title(), system_time() - now);
 			break;
@@ -2460,6 +2461,7 @@ BWindow::_InitData(BRect frame, const char* title, window_look look,
 	fFlags = flags | B_ASYNCHRONOUS_CONTROLS;
 
 	fInTransaction = false;
+	fUpdateRequested = false;
 	fActive = false;
 	fShowLevel = 0;