- the 'activitate window' call in mainloop, which was removed to save

performance, gave display errors in some occasions.
  now its moved to the main drawing loop, which is not for each event
  luckily.
  tested at windows by ztonzy

source/blender/src/editscreen.c

@@ -868,6 +868,8 @@ static void screen_dispatch_events(void) {
 	int events_remaining= 1;
 	ScrArea *sa;
 
+	window_make_active(mainwin); // added it here instead of screenmain (ton)
+
 	while (events_remaining) {
 		events_remaining= 0;
 				
@@ -934,7 +936,7 @@ void screenmain(void)
 			event= screen_qread(&val, &ascii);
 		}
 		
-		// window_make_active(mainwin); // (only for inputchange, removed, ton)
+		// window_make_active(mainwin); // (only for inputchange, removed, (ton))
 
 		if (event==INPUTCHANGE) {
 			window_make_active(mainwin);