From bfa7ac910d4d79edeb5a53a8700da72807e86624 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Wed, 28 Dec 2016 10:32:22 +0100
Subject: [PATCH] workaround for performance problem with Qt 5.5.x

---
 src/Gui/Quarter/QuarterWidget.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/Gui/Quarter/QuarterWidget.cpp b/src/Gui/Quarter/QuarterWidget.cpp
index 37bf36d432..5e918d3b60 100644
--- a/src/Gui/Quarter/QuarterWidget.cpp
+++ b/src/Gui/Quarter/QuarterWidget.cpp
@@ -824,7 +824,12 @@ QuarterWidget::redraw(void)
   // we're triggering the next paintGL(). Set a flag to remember this
   // to avoid that we process the delay queue in paintGL()
   PRIVATE(this)->processdelayqueue = false;
+#if QT_VERSION >= 0x050500 && QT_VERSION < 0x050600
+  // With Qt 5.5.x there is a major performance problem
+  this->viewport()->update();
+#else
   this->viewport()->repaint();
+#endif
 }
 
 /*!