sdl2: Do not leave grab when fullscreen

Prevents displaying of a doubled mouse pointer when moving the pointer
to the screen edges when fullscreen.
Signed-off-by: NJindrich Makovicka <makovick@gmail.com>
Message-Id: <20171112193032.9724-8-makovick@gmail.com>
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

ui/sdl2.c

@@ -471,8 +471,9 @@ static void handle_mousemotion(SDL_Event *ev)
         SDL_GetWindowSize(scon->real_window, &scr_w, &scr_h);
         max_x = scr_w - 1;
         max_y = scr_h - 1;
-        if (gui_grab && (ev->motion.x == 0 || ev->motion.y == 0 ||
-                         ev->motion.x == max_x || ev->motion.y == max_y)) {
+        if (gui_grab && !gui_fullscreen
+            && (ev->motion.x == 0 || ev->motion.y == 0 ||
+                ev->motion.x == max_x || ev->motion.y == max_y)) {
             sdl_grab_end(scon);
         }
         if (!gui_grab &&