Re: [Qemu-devel] [PATCH 1/8] sdl2: Fix broken display updating after the window is hidden

[Gerd Hoffmann]

On Sun, Nov 12, 2017 at 08:30:25PM +0100, Jindrich Makovicka wrote:
> With SDL 2.0.6, calling SDL_ShowWindow during SDL_WINDOWEVENT_HIDDEN
> blocks all subsequent display updates.
> 
> Instead of trying to override the change, just update the scon->hidden
> flag.

Has for me the side effect that sometimes I have to press ctrl-alt-2
twice.  Showing window first time works.  Hiding the window works too.
Showing it the second time needs the double keypress.

Added fprintfs to figure why [1].  Reason for that seems to be a suspious
SDL_WINDOWEVENT_SHOWN event from SDL, so qemu thinks the window is
visible even though it actually is hidden.

Have a slightly older SDL version (2.0.3).  Do you see that effect with
2.0.6 too?

cheers,
  Gerd

https://www.kraxel.org/cgit/qemu/commit/?h=testing/sdl&id=8235bfb66e7c82870ff1b1f47bdaaf4f522c5444