From 0d35dc0a838ec9854c792ca36d681f03db3f72e3 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Tue, 28 Aug 2018 13:07:26 -0700
Subject: [PATCH] Fixed bug 1155 - Should
 SDL_WM_GrabInput()/X11_GrabInputNoLock() block?

Makes SDL-1.2 SDL_WM_GrabInput() non-blocking in case of SDL window is not
viewable. Patch provided by <pbonzini@redhat.com>.
---
 src/video/x11/SDL_x11wm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/video/x11/SDL_x11wm.c b/src/video/x11/SDL_x11wm.c
index 14c816b94..fe0f6a54a 100644
--- a/src/video/x11/SDL_x11wm.c
+++ b/src/video/x11/SDL_x11wm.c
@@ -352,13 +352,14 @@ SDL_GrabMode X11_GrabInputNoLock(_THIS, SDL_GrabMode mode)
 			result = XGrabPointer(SDL_Display, SDL_Window, True, 0,
 						GrabModeAsync, GrabModeAsync,
 						SDL_Window, None, CurrentTime);
-			if ( result == GrabSuccess ) {
+			if ( result == GrabSuccess || result == GrabNotViewable ) {
 				break;
 			}
 			SDL_Delay(100);
 		}
 		if ( result != GrabSuccess ) {
 			/* Uh, oh, what do we do here? */ ;
+			return(SDL_GRAB_OFF);
 		}
 		/* Now grab the keyboard */
 		XGrabKeyboard(SDL_Display, WMwindow, True,