From d916aae54f098daee33fa311f226bc87f8e3099e Mon Sep 17 00:00:00 2001
From: Thomas A Caswell <tcaswell@gmail.com>
Date: Thu, 9 Nov 2023 22:14:50 -0500
Subject: [PATCH] FIX: allow re-shown Qt windows to be re-destroyed

When a Qt window is closed we do not strip off the Qt components and it
is technically possible to re-show it.  However, the latch we use to
detect re-entrant destruction does not get reset so the figure can not be
re-destroyed.
---
 lib/matplotlib/backends/backend_qt.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/matplotlib/backends/backend_qt.py b/lib/matplotlib/backends/backend_qt.py
index cbc490ef6cd1..b79698f1d661 100644
--- a/lib/matplotlib/backends/backend_qt.py
+++ b/lib/matplotlib/backends/backend_qt.py
@@ -602,6 +602,7 @@ def start_main_loop(cls):
                 qt_compat._exec(qapp)
 
     def show(self):
+        self.window._destroying = False
         self.window.show()
         if mpl.rcParams['figure.raise_window']:
             self.window.activateWindow()