From 6a3b0413dced7a1b50b21c5d7e6649ed8b777972 Mon Sep 17 00:00:00 2001
From: Frank Praznik <[EMAIL REDACTED]>
Date: Wed, 27 May 2026 12:01:03 -0400
Subject: [PATCH] x11: Fix boolean/enum comparison
This could set the pending flag even if there was no state change requested, which would cause errant sync timeouts in certain situations.
---
src/video/x11/SDL_x11window.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/video/x11/SDL_x11window.c b/src/video/x11/SDL_x11window.c
index f7befe07f9392..e2c8f59c7bc89 100644
--- a/src/video/x11/SDL_x11window.c
+++ b/src/video/x11/SDL_x11window.c
@@ -1891,7 +1891,8 @@ static SDL_FullscreenResult X11_SetWindowFullscreenViaWM(SDL_VideoDevice *_this,
X11_XSendEvent(display, RootWindow(display, displaydata->screen), 0,
SubstructureNotifyMask | SubstructureRedirectMask, &e);
- if (!!(window->flags & SDL_WINDOW_FULLSCREEN) != fullscreen) {
+ // Only set the pending flag if the fullscreen state actually changed.
+ if (((window->flags & SDL_WINDOW_FULLSCREEN) != 0) != (fullscreen != 0)) {
data->pending_operation |= X11_PENDING_OP_FULLSCREEN;
}