From 6138770ef216d3e2008eb270d542edb88c5701c4 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Wed, 28 Apr 2021 12:02:52 +0200
Subject: [PATCH] Gui: [skip ci] fix crash in SequencerBar::setProgress or
 SequencerDialog::setProgress when used in worker threads

---
 src/Gui/ProgressBar.cpp    | 10 +++++++++-
 src/Gui/ProgressDialog.cpp | 10 +++++++++-
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/src/Gui/ProgressBar.cpp b/src/Gui/ProgressBar.cpp
index fcaff6adb5..9225d24bf3 100644
--- a/src/Gui/ProgressBar.cpp
+++ b/src/Gui/ProgressBar.cpp
@@ -226,7 +226,15 @@ void SequencerBar::nextStep(bool canAbort)
 
 void SequencerBar::setProgress(size_t step)
 {
-    d->bar->show();
+    QThread* currentThread = QThread::currentThread();
+    QThread* thr = d->bar->thread(); // this is the main thread
+    if (thr != currentThread) {
+        QMetaObject::invokeMethod(d->bar, "show", Qt::QueuedConnection);
+    }
+    else {
+        d->bar->show();
+    }
+
     setValue((int)step);
 }
 
diff --git a/src/Gui/ProgressDialog.cpp b/src/Gui/ProgressDialog.cpp
index 519ad2e72e..81cec75712 100644
--- a/src/Gui/ProgressDialog.cpp
+++ b/src/Gui/ProgressDialog.cpp
@@ -152,7 +152,15 @@ void SequencerDialog::nextStep(bool canAbort)
 
 void SequencerDialog::setProgress(size_t step)
 {
-    d->dlg->show();
+    QThread* currentThread = QThread::currentThread();
+    QThread* thr = d->dlg->thread(); // this is the main thread
+    if (thr != currentThread) {
+        QMetaObject::invokeMethod(d->dlg, "show", Qt::QueuedConnection);
+    }
+    else {
+        d->dlg->show();
+    }
+
     setValue((int)step);
 }