From 1df90e17421fd6e32ea4b740aa76059e7ebb2c93 Mon Sep 17 00:00:00 2001
From: kgabor545 <99401713+kgabor545@users.noreply.github.com>
Date: Mon, 3 Oct 2022 11:05:24 +0200
Subject: [PATCH] get_active_window gives back None, causing flickering on
 grouped buttons especially with mouse wheel prev/next window. Better have
 prev window active than none, so the flickering is gone

---
 dockbarx/dockbar.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/dockbarx/dockbar.py b/dockbarx/dockbar.py
index 51ae10b..6115dee 100644
--- a/dockbarx/dockbar.py
+++ b/dockbarx/dockbar.py
@@ -875,6 +875,8 @@ def __on_active_window_changed(self, screen, previous_active_window):
             group.set_active_window(None)
         # Activate new windowbutton
         active_window = screen.get_active_window()
+        if active_window == None:
+            active_window = previous_active_window
         if active_window in self.windows:
             active_group_name = self.windows[active_window]
             active_group = self.groups[active_group_name]