Don't move locked strokes

src/domain/UBGraphicsStrokesGroup.cpp

@@ -128,10 +128,12 @@ void UBGraphicsStrokesGroup::mousePressEvent(QGraphicsSceneMouseEvent *event)
 
 void UBGraphicsStrokesGroup::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
 {
+    if (!isLocked(this)) {
         QGraphicsItemGroup::mouseMoveEvent(event);
 
         event->accept();
         setSelected(false);
+    }
 }
 
 void UBGraphicsStrokesGroup::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)