Can not grab mouse

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401069

src/video/gem/SDL_gemwm.c

@@ -125,5 +125,5 @@ int GEM_IconifyWindow(_THIS)
 
 SDL_GrabMode GEM_GrabInput(_THIS, SDL_GrabMode mode)
 {
-	return mode;
+	return SDL_GRAB_OFF;
 }