From 200074e580cbefadf20d5ee9d492846ab0d8e498 Mon Sep 17 00:00:00 2001
From: Hojjat <hojjat.abdollahi@gmail.com>
Date: Wed, 13 May 2026 17:23:58 -0600
Subject: [PATCH 1/2] fix: fullscreen x11 games opening as floating/tiled
 windows

---
 src/xwayland.rs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/xwayland.rs b/src/xwayland.rs
index c4549c9e..4e75579d 100644
--- a/src/xwayland.rs
+++ b/src/xwayland.rs
@@ -809,12 +809,14 @@ impl XwmHandler for State {
             );
         }
         if !shell.pending_windows.iter().any(|w| w.surface == window) {
+            let fullscreen = window.is_fullscreen().then(|| seat.active_output());
+            let maximized = window.is_maximized();
             let surface = CosmicSurface::from(window);
             shell.pending_windows.push(PendingWindow {
                 surface,
                 seat,
-                fullscreen: None,
-                maximized: false,
+                fullscreen,
+                maximized,
                 sticky: false,
             })
         }

From 451b8319d633e50d729c60a6719a4dd57d751574 Mon Sep 17 00:00:00 2001
From: Hojjat <hojjat.abdollahi@gmail.com>
Date: Wed, 20 May 2026 18:58:27 -0600
Subject: [PATCH 2/2] fix: ignore configure requests from fullscreen windows

Fixes steam big picture mode full screen not taking the whole screen
---
 src/xwayland.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/xwayland.rs b/src/xwayland.rs
index 4e75579d..4c2f3b55 100644
--- a/src/xwayland.rs
+++ b/src/xwayland.rs
@@ -916,7 +916,11 @@ impl XwmHandler for State {
         // We only allow floating X11 windows to resize themselves. Nothing else
         let shell = self.common.shell.read();
 
-        // TODO: Fullscreen
+        if window.is_fullscreen() {
+            let _ = window.configure(None);
+            return;
+        }
+
         if let Some(mapped) = shell
             .element_for_surface(&window)
             .filter(|mapped| !mapped.is_minimized())