Reset the feedback pane point for leaving the form editor

Reviewed-by: kkoehne

src/plugins/qmldesigner/components/formeditor/formeditorgraphicsview.cpp

@@ -123,7 +123,11 @@ void FormEditorGraphicsView::mouseReleaseEvent(QMouseEvent *event)
     m_feedbackOriginPoint = QPoint();
 }
 
-
+void FormEditorGraphicsView::leaveEvent(QEvent *event)
+{
+     m_feedbackOriginPoint = QPoint();
+     QGraphicsView::leaveEvent(event);
+}
 
 void FormEditorGraphicsView::drawForeground(QPainter *painter, const QRectF &/*rect*/ )
 {

src/plugins/qmldesigner/components/formeditor/formeditorgraphicsview.h

@@ -49,6 +49,7 @@ protected:
     void wheelEvent(QWheelEvent *event);
     void mouseMoveEvent(QMouseEvent *event);
     void mouseReleaseEvent(QMouseEvent *event);
+    void leaveEvent(QEvent *);
     void keyPressEvent(QKeyEvent *event);
 private:
     QmlItemNode m_feedbackNode;