SDL: Safety fix: clear "_this->current_glwin" when destroying the window (6574e)

SDL Commits
1 
From 6574e5eb57da52d9072a196af70e7406b8757a35 Mon Sep 17 00:00:00 2001
From: Sylvain <[EMAIL REDACTED]>
Date: Tue, 28 Mar 2023 09:48:58 +0200
Subject: [PATCH] Safety fix: clear "_this->current_glwin" when destroying the
 window

(cherry picked from commit 0c048d98af449f1bc540e256c90eb792f1effff4)
---
 src/video/SDL_video.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/video/SDL_video.c b/src/video/SDL_video.c
index 7e774913fd4c..573b38f050a3 100644
--- a/src/video/SDL_video.c
+++ b/src/video/SDL_video.c
@@ -3272,6 +3272,10 @@ void SDL_DestroyWindow(SDL_Window *window)
         _this->grabbed_window = NULL; /* ungrabbing input. */
     }
 
+    if (_this->current_glwin == window) {
+        _this->current_glwin = NULL;
+    }
+
     /* Now invalidate magic */
     window->magic = NULL;