SDL: Make sure the mouse and keyboard focus is cleared when a window is hidden

SDL Commits
1 
From a16b241b8937db7701fce6c1f410e3af84f8c4e6 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Tue, 25 Jul 2023 11:47:55 -0700
Subject: [PATCH] Make sure the mouse and keyboard focus is cleared when a
 window is hidden

---
 src/video/vivante/SDL_vivantevideo.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/video/vivante/SDL_vivantevideo.c b/src/video/vivante/SDL_vivantevideo.c
index 89faed11c486..06c69dd34851 100644
--- a/src/video/vivante/SDL_vivantevideo.c
+++ b/src/video/vivante/SDL_vivantevideo.c
@@ -343,6 +343,8 @@ void VIVANTE_HideWindow(SDL_VideoDevice *_this, SDL_Window *window)
     SDL_WindowData *data = window->driverdata;
     vdkHideWindow(data->native_window);
 #endif
+    SDL_SetMouseFocus(NULL);
+    SDL_SetKeyboardFocus(NULL);
 }
 
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