fix automatic update of dependency graph for Qt5

src/Gui/GraphvizView.cpp

@@ -93,6 +93,8 @@ public:
         // This is needed because embedding a QProcess into a QThread
         // causes some problems with Qt5.
         run();
+        // Can't use the finished() signal of QThread
+        emitFinished();
 #else
         start();
 #endif
@@ -136,6 +138,7 @@ public:
 Q_SIGNALS:
     void svgFileRead(const QByteArray & data);
     void error();
+    void emitFinished();
 
 private:
     QProcess dotProc, unflattenProc;
@@ -171,6 +174,9 @@ GraphvizView::GraphvizView(App::Document & _doc, QWidget* parent)
 
     // Create worker thread
     thread = new GraphvizWorker(this);
+#if QT_VERSION >= 0x050000
+    connect(thread, SIGNAL(emitFinished()), this, SLOT(done()));
+#endif
     connect(thread, SIGNAL(finished()), this, SLOT(done()));
     connect(thread, SIGNAL(error()), this, SLOT(error()));
     connect(thread, SIGNAL(svgFileRead(const QByteArray &)), this, SLOT(svgFileRead(const QByteArray &)));
@@ -296,7 +302,7 @@ void GraphvizView::done()
     if (nPending > 0) {
         nPending = 0;
         updateSvgItem(doc);
-        thread->start();
+        thread->startThread();
     }
 }