From e19527c369e0e5f0e6eafbea401e440c1cebed57 Mon Sep 17 00:00:00 2001
From: Matthias Kuhn <matthias@opengis.ch>
Date: Tue, 12 Mar 2019 08:54:00 +0100
Subject: [PATCH] Fix geometry generator type visibility glitch

---
 src/app/qgslabelinggui.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/app/qgslabelinggui.cpp b/src/app/qgslabelinggui.cpp
index 12e885a4f7f4..4d3ec27ddc03 100644
--- a/src/app/qgslabelinggui.cpp
+++ b/src/app/qgslabelinggui.cpp
@@ -757,7 +757,15 @@ void QgsLabelingGui::validateGeometryGeneratorExpression()
     }
   }
 
-  mGeometryGeneratorWarningLabel->setVisible( !valid );
+  // The collapsible groupbox internally changes the visibility of this
+  // Work around by setting the visibility deferred in the next event loop cycle.
+  QTimer *timer = new QTimer();
+  connect( timer, &QTimer::timeout, this, [this, valid]()
+  {
+    mGeometryGeneratorWarningLabel->setVisible( !valid );
+  } );
+  connect( timer, &QTimer::timeout, timer, &QTimer::deleteLater );
+  timer->start( 0 );
 }
 
 void QgsLabelingGui::determineGeometryGeneratorType()