Hi,

I had to apply the attached patch to make the SDL2 UI of any use - the
vanilla version (both Debian Sid package and qemu git master) stops
updating after the window is obscured, minimized, or after a virtual
desktop switch.

It partially reverts the following hack:

commit d3f3a0f453ea590be529079ae214c200bb5ecc1a
Author: Max Reitz <[email protected]>
Date:   Fri Dec 12 10:52:52 2014 +0100

    sdl2: Work around SDL2 SDL_ShowWindow() bug

Regards,
-- 
Jindřich Makovička
From cefe274a1877565efcca9ccaa943d43a93e3bbef Mon Sep 17 00:00:00 2001
From: Jindrich Makovicka <[email protected]>
Date: Sat, 14 Oct 2017 11:27:50 +0200
Subject: [PATCH] sdl2: Fix broken display updating after the window is hidden

With SDL 2.0.6, calling SDL_ShowWindow during SDL_WINDOWEVENT_HIDDEN
blocks all subsequent display updates.
---
 ui/sdl2.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/ui/sdl2.c b/ui/sdl2.c
index 53dd447fd2..7f51933234 100644
--- a/ui/sdl2.c
+++ b/ui/sdl2.c
@@ -576,11 +576,6 @@ static void handle_windowevent(SDL_Event *ev)
             SDL_HideWindow(scon->real_window);
         }
         break;
-    case SDL_WINDOWEVENT_HIDDEN:
-        if (!scon->hidden) {
-            SDL_ShowWindow(scon->real_window);
-        }
-        break;
     }
 }
 
-- 
2.15.0.rc0

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