SDL: Make sure the X event is an Xkb event before checking the Xkb event type

SDL Commits
1 
From eda4c40732f788ac06f607c70344f801d2f82454 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Wed, 10 Nov 2021 12:46:54 -0800
Subject: [PATCH] Make sure the X event is an Xkb event before checking the Xkb
 event type

---
 src/video/x11/SDL_x11events.c   | 3 ++-
 src/video/x11/SDL_x11keyboard.c | 2 +-
 src/video/x11/SDL_x11video.h    | 1 +
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/video/x11/SDL_x11events.c b/src/video/x11/SDL_x11events.c
index 1bf10d5670..5d0517e218 100644
--- a/src/video/x11/SDL_x11events.c
+++ b/src/video/x11/SDL_x11events.c
@@ -808,7 +808,8 @@ X11_DispatchEvent(_THIS, XEvent *xevent)
             if (SDL_GetKeyboardFocus() != NULL) {
                 X11_ReconcileKeyboardState(_this);
             }
-        } else if (xevent->type == MappingNotify || xkbEvent->any.xkb_type == XkbStateNotify) {
+        } else if (xevent->type == MappingNotify ||
+                   (xevent->type == videodata->xkb_event && xkbEvent->any.xkb_type == XkbStateNotify)) {
             /* Has the keyboard layout changed? */
             const int request = xevent->xmapping.request;
 
diff --git a/src/video/x11/SDL_x11keyboard.c b/src/video/x11/SDL_x11keyboard.c
index 2d8c24cccd..2214ba3e3e 100644
--- a/src/video/x11/SDL_x11keyboard.c
+++ b/src/video/x11/SDL_x11keyboard.c
@@ -278,7 +278,7 @@ X11_InitKeyboard(_THIS)
         int xkb_major = XkbMajorVersion;
         int xkb_minor = XkbMinorVersion;
 
-        if (X11_XkbQueryExtension(data->display, NULL, NULL, NULL, &xkb_major, &xkb_minor)) {
+        if (X11_XkbQueryExtension(data->display, NULL, &data->xkb_event, NULL, &xkb_major, &xkb_minor)) {
             data->xkb = X11_XkbGetMap(data->display, XkbAllClientInfoMask, XkbUseCoreKbd);
         }
 
diff --git a/src/video/x11/SDL_x11video.h b/src/video/x11/SDL_x11video.h
index 1609674632..26617e606a 100644
--- a/src/video/x11/SDL_x11video.h
+++ b/src/video/x11/SDL_x11video.h
@@ -143,6 +143,7 @@ typedef struct SDL_VideoData
 #if SDL_VIDEO_DRIVER_X11_HAS_XKBKEYCODETOKEYSYM
     XkbDescPtr xkb;
 #endif
+    int xkb_event;
 
     KeyCode filter_code;
     Time    filter_time;