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Makes SDL-1.2 SDL_WM_GrabInput() non-blocking in case of SDL window is not
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viewable. Patch provided by <pbonzini@redhat.com>.
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See <http://bugzilla.libsdl.org/show_bug.cgi?id=1155>.
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--- ./src/video/x11/SDL_x11wm.c	2007-12-31 04:48:13.000000000 +0000
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+++ ./src/video/x11/SDL_x11wm.c	2009-01-15 10:27:14.000000000 +0000
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@@ -351,13 +351,14 @@ SDL_GrabMode X11_GrabInputNoLock(_THIS, 
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 			result = XGrabPointer(SDL_Display, SDL_Window, True, 0,
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 						GrabModeAsync, GrabModeAsync,
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 						SDL_Window, None, CurrentTime);
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-			if ( result == GrabSuccess ) {
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+			if ( result == GrabSuccess || result == GrabNotViewable ) {
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 				break;
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 			}
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 			SDL_Delay(100);
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 		}
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 		if ( result != GrabSuccess ) {
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 			/* Uh, oh, what do we do here? */ ;
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+			return(SDL_GRAB_OFF);
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 		}
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 		/* Now grab the keyboard */
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 		XGrabKeyboard(SDL_Display, WMwindow, True,