From 61c7fbfbb7fe6a68c557f9e26df158b1d44c04fe Mon Sep 17 00:00:00 2001
From: CJ van den Berg <cj@vdbonline.com>
Date: Wed, 8 Apr 2026 21:22:23 +0200
Subject: [PATCH] fix(gui): disable vsync to workaround hang when window is
 unmapped

---
 src/gui/wio/app.zig | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/gui/wio/app.zig b/src/gui/wio/app.zig
index e38f4b73..61ec5a23 100644
--- a/src/gui/wio/app.zig
+++ b/src/gui/wio/app.zig
@@ -406,6 +406,13 @@ fn wioLoop() void {
     defer window.destroy();
 
     window.makeContextCurrent();
+    // Disable EGL vsync throttling so eglSwapBuffers() returns immediately.
+    // Without this, eglSwapBuffers() blocks waiting for a frame callback from
+    // the compositor. Compositors do not send frame callbacks for surfaces on
+    // background virtual desktops, so any paint while the window is hidden
+    // causes eglSwapBuffers() to stall indefinitely, freezing the Wayland
+    // event loop and triggering an "Application Not Responding" dialog.
+    window.swapInterval(0);
 
     sg.setup(.{
         .logger = .{ .func = slog.func },