From 9667308e6def22e9b1fa352357a788749ad92c74 Mon Sep 17 00:00:00 2001
From: srdusr <99972264+srdusr@users.noreply.github.com>
Date: Fri, 7 Mar 2025 22:07:00 +0200
Subject: Fix stale ghost content after window move/resize/close on real
 hardware

The udev backend's damage tracking only forced a full repaint (ages =
[0, 0]) on a workspace switch or a VT-switch resume. An ordinary
move/resize/open/close/restack within the same workspace relied
entirely on OutputDamageTracker's own per-element diffing to compute
correct damage for the region a window vacated - which doesn't always
hold: maximizing a window over a second one, then un-maximizing, left
a persistent ghost of the second window's old titlebar/status text
sitting in the vacated corner, unchanged across multiple otherwise-
idle frames.

render_udev_frame now also hashes every visible window's id and rect
each frame and forces the same full-repaint reset whenever that
signature changes - the same "defensive, not a fix for a proven bug
in the diffing itself" reasoning the existing workspace-switch reset
already uses, just triggered by a second, complementary condition.
---
 crates/wayland/src/udev/platform.rs | 1 +
 1 file changed, 1 insertion(+)

(limited to 'crates/wayland/src/udev/platform.rs')

diff --git a/crates/wayland/src/udev/platform.rs b/crates/wayland/src/udev/platform.rs
index 1d2ef0e..2868f15 100644
--- a/crates/wayland/src/udev/platform.rs
+++ b/crates/wayland/src/udev/platform.rs
@@ -130,6 +130,7 @@ impl UdevPlatform {
             session: session.clone(),
             disabled_connectors: std::collections::HashSet::new(),
             last_rendered_workspace: None,
+            last_rendered_layout: None,
         };
 
         let mut state = CompState {
-- 
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