From 3c5ca36081e672d3d8f3cdaf494317a511ab0317 Mon Sep 17 00:00:00 2001
From: Matthias Koefferlein <matthias@koefferlein.de>
Date: Sun, 31 Jul 2022 00:10:36 +0200
Subject: [PATCH] [Consider merging] fixed a potential race condition with
 invalid Shapes container after clear

---
 src/db/db/dbShapes.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/db/db/dbShapes.cc b/src/db/db/dbShapes.cc
index 250918349..962234ee1 100644
--- a/src/db/db/dbShapes.cc
+++ b/src/db/db/dbShapes.cc
@@ -998,6 +998,8 @@ Shapes::clear ()
 {
   if (!m_layers.empty ()) {
 
+    invalidate_state ();  //  HINT: must come before the change is done!
+
     for (tl::vector<LayerBase *>::const_iterator l = m_layers.end (); l != m_layers.begin (); ) {
       //  because the undo stack will do a push, we need to remove layers from the back (this is the last undo
       //  element to be executed)
@@ -1010,7 +1012,6 @@ Shapes::clear ()
       }
     }
 
-    invalidate_state ();  //  HINT: must come before the change is done!
     m_layers.clear ();
 
   }