From 5b5189a8d69378e4216062bab6932978ce303be7 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Mon, 16 Jan 2017 00:09:39 +0100
Subject: [PATCH] workaround for running graphviz under Qt5

---
 src/Gui/GraphvizView.cpp | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/Gui/GraphvizView.cpp b/src/Gui/GraphvizView.cpp
index 65b3f432dd63..1c95654a17f0 100644
--- a/src/Gui/GraphvizView.cpp
+++ b/src/Gui/GraphvizView.cpp
@@ -67,7 +67,16 @@ class GraphvizWorker : public QThread {
     GraphvizWorker(QObject * parent = 0)
         : QThread(parent)
     {
+#if QT_VERSION < 0x050000
         proc.moveToThread(this);
+#endif
+    }
+
+    virtual ~GraphvizWorker()
+    {
+#if QT_VERSION >= 0x050000
+        proc.moveToThread(this);
+#endif
     }
 
     void setData(const QByteArray & data)
@@ -75,6 +84,18 @@ class GraphvizWorker : public QThread {
         str = data;
     }
 
+    void startThread() {
+#if QT_VERSION >= 0x050000
+        // This doesn't actually run a thread but calls the function
+        // directly in the main thread.
+        // This is needed because embedding a QProcess into a QThread
+        // causes some problems with Qt5.
+        run();
+#else
+        start();
+#endif
+    }
+
     void run() {
         // Write data to process
         proc.write(str);
@@ -210,7 +231,7 @@ void GraphvizView::updateSvgItem(const App::Document &doc)
 
     // Update worker thread, and start it
     thread->setData(QByteArray(graphCode.c_str(), graphCode.size()));
-    thread->start();
+    thread->startThread();
 }
 
 void GraphvizView::svgFileRead(const QByteArray & data)