From d03f6186607067ba04a09689711c6987a1bf7b68 Mon Sep 17 00:00:00 2001
From: Elias Naur <mail@eliasnaur.com>
Date: Fri, 3 Sep 2021 12:11:55 +0200
Subject: [PATCH] app: [Windows] avoid deadlock when changing window
 configuration

Some window configurations lead to WM_SIZE messages when changed, which
leads to deadlock because our window proc is not re-entrant. Avoid the
issues by ignoring redundant messages.

Fixes gio#262

Signed-off-by: Elias Naur <mail@eliasnaur.com>
---
 app/os_windows.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/app/os_windows.go b/app/os_windows.go
index 2fcf62a4..1bdacb76 100644
--- a/app/os_windows.go
+++ b/app/os_windows.go
@@ -444,8 +444,10 @@ func (w *window) Wakeup() {
 }
 
 func (w *window) setStage(s system.Stage) {
-	w.stage = s
-	w.w.Event(system.StageEvent{Stage: s})
+	if s != w.stage {
+		w.stage = s
+		w.w.Event(system.StageEvent{Stage: s})
+	}
 }
 
 func (w *window) draw(sync bool) {