SDL doesn't grab Alt+F4 under Windows by default. Pressing Alt+F4 thus closes
the VM immediately without confirmation, possibly leading to data loss. Fix
this by always grabbing Alt+F4 on Windows hosts, too.

Signed-off-by: Bernhard Beschow <shen...@gmail.com>
---
  ui/sdl2.c | 1 +
  1 file changed, 1 insertion(+)

Reviewed-by: Volker Rümelin <vr_q...@t-online.de>

diff --git a/ui/sdl2.c b/ui/sdl2.c
index 8af8b89f1d..00aadfae37 100644
--- a/ui/sdl2.c
+++ b/ui/sdl2.c
@@ -859,6 +859,7 @@ static void sdl2_display_init(DisplayState *ds, 
DisplayOptions *o)
  #ifdef SDL_HINT_ALLOW_ALT_TAB_WHILE_GRABBED
      SDL_SetHint(SDL_HINT_ALLOW_ALT_TAB_WHILE_GRABBED, "0");
  #endif
+    SDL_SetHint(SDL_HINT_WINDOWS_NO_CLOSE_ON_ALT_F4, "1");
      memset(&info, 0, sizeof(info));
      SDL_VERSION(&info.version);


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