From 2a3ec8f45ccbce17da479f0e650d29d14a97901a Mon Sep 17 00:00:00 2001
From: Jeroen Schweitzer <jpmschweitzer@gmail.com>
Date: Thu, 23 Apr 2026 09:04:51 +0200
Subject: [PATCH] force X11 backend for frameless window on KDE Wayland

GTK3 doesn't implement the xdg-decoration Wayland protocol, so
KWin always adds server-side decorations regardless of
gtk_window_set_decorated(FALSE). GDK_BACKEND=x11 forces XWayland
where MOTIF_WM_HINTS reliably removes decorations. Revisit when
Flutter moves to GTK4 or implements xdg-decoration natively.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 0008b857..fee11a7b 100644
--- a/Makefile
+++ b/Makefile
@@ -19,7 +19,7 @@ help: ## Show this help.
 
 .PHONY: run
 run: ## Launch the Flutter desktop app.
-	GTK_CSD=1 LD_LIBRARY_PATH=$(CURDIR)/native/linux-x64$${LD_LIBRARY_PATH:+:$$LD_LIBRARY_PATH} flutter run -d linux
+	GDK_BACKEND=x11 LD_LIBRARY_PATH=$(CURDIR)/native/linux-x64$${LD_LIBRARY_PATH:+:$$LD_LIBRARY_PATH} flutter run -d linux
 
 .PHONY: pubget
 pubget: ## flutter pub get.