From 66047f7daa5223259cb1e47ec5f833f55c63dec9 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Wed, 22 Mar 2023 10:22:21 +0100
Subject: [PATCH] Gui: issue #8939: timers are moved between non-QThreads

---
 src/Gui/Tree.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/Gui/Tree.cpp b/src/Gui/Tree.cpp
index 7cf6c32644..a23741fdb5 100644
--- a/src/Gui/Tree.cpp
+++ b/src/Gui/Tree.cpp
@@ -3002,6 +3002,12 @@ void TreeWidget::onSelectTimer() {
 
 void TreeWidget::onSelectionChanged(const SelectionChanges& msg)
 {
+    // When running from a different thread Qt will raise a warning
+    // when trying to start the QTimer
+    if (Q_UNLIKELY(thread() != QThread::currentThread())) {
+        return;
+    }
+
     switch (msg.Type)
     {
     case SelectionChanges::AddSelection: