add limits for resizing layouts

include/ui/movablerect.h

@@ -55,6 +55,7 @@ public:
     }
 
     void updatePosFromRect(QRect newPos);
+    void setLimit(QRect limit) { this->limit = limit; }
 
 protected:
     void hoverMoveEvent(QGraphicsSceneHoverEvent *event) override;
@@ -71,6 +72,8 @@ private:
     QPointF clickedPos = QPointF();
     QRect clickedRect;
 
+    QRect limit = QRect();
+
     int lineWidth = 8;
 
 signals: