From d539a2742320eb262a8484763e45aa039629ecc4 Mon Sep 17 00:00:00 2001
From: Markus Rosenstihl <markus.rosenstihl@pkm.tu-darmstadt.de>
Date: Mon, 19 Oct 2026 23:16:14 +0200
Subject: [PATCH] ignore duplicate quit events when the window is closed twice

quit_event ran its cleanup path again when a second delete-event
arrived after the state had already switched to Quit_State, hanging
the application on shutdown. Return early instead.

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>
---
 src/damaris/gui/DamarisGUI.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/damaris/gui/DamarisGUI.py b/src/damaris/gui/DamarisGUI.py
index 3f851c5..b366cfb 100644
--- a/src/damaris/gui/DamarisGUI.py
+++ b/src/damaris/gui/DamarisGUI.py
@@ -333,6 +333,9 @@ class DamarisGUI:
         """
         expecting quit event for main application
         """
+        if self.state == DamarisGUI.Quit_State:
+            # quit already handled, e.g. window closed twice
+            return True
         if self.state in [ DamarisGUI.Edit_State, DamarisGUI.Quit_State ]:
             self.state = DamarisGUI.Quit_State
             # do a cleanup...