Apparently it is possible for X to send an event to a hidden SDL2
window, leading to SDL2 believing it is now shown. SDL2 will pass the
SDL_WINDOWEVENT_SHOWN message to the application without actually
showing the window; the problem is that the next SDL_ShowWindow() will
be a no-op because SDL2 assumes the window is already shown.
The correct way to react to SDL_WINDOWEVENT_SHOWN would be to clear
scon->hidden (analogous for SDL_WINDOWEVENT_HIDDEN). However, due to the
window not actually being shown, this will somehow not be correct after
all.
Therefore, just hide the window on SDL_WINDOWEVENT_SHOWN if it is
supposed to be hidden (and analogous for SDL_WINDOWEVENT_HIDDEN).
Signed-off-by: Max Reitz <mre...@redhat.com>
---
ui/sdl2.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/ui/sdl2.c b/ui/sdl2.c
index fdc762f..7297c02 100644
--- a/ui/sdl2.c
+++ b/ui/sdl2.c
@@ -548,6 +548,16 @@ static void handle_windowevent(SDL_Event *ev)
qemu_system_shutdown_request();
}
break;
+ case SDL_WINDOWEVENT_SHOWN:
+ if (scon->hidden) {
+ SDL_HideWindow(scon->real_window);
+ }
+ break;
+ case SDL_WINDOWEVENT_HIDDEN:
+ if (!scon->hidden) {
+ SDL_ShowWindow(scon->real_window);
+ }
+ break;
}
}
--
1.9.3
