Frame size doesn't depends on zoom.

src/domain/UBGraphicsItemDelegate.cpp

@@ -115,6 +115,7 @@ UBGraphicsItemDelegate::UBGraphicsItemDelegate(QGraphicsItem* pDelegated, QObjec
     , mToolBarUsed(useToolBar)
 {
     // NOOP
+    connect(UBApplication::boardController, SIGNAL(zoomChanged(qreal)), this, SLOT(onZoomChanged()));
 }
 
 void UBGraphicsItemDelegate::init()
@@ -535,6 +536,12 @@ void UBGraphicsItemDelegate::commitUndoStep()
     }
 }
 
+void UBGraphicsItemDelegate::onZoomChanged()
+{
+    mAntiScaleRatio = 1 / (UBApplication::boardController->systemScaleFactor() * UBApplication::boardController->currentZoom());
+
+    positionHandles();
+}
 
 void UBGraphicsItemDelegate::buildButtons()
 {

src/domain/UBGraphicsItemDelegate.h

@@ -259,6 +259,8 @@ class UBGraphicsItemDelegate : public QObject
         void increaseZlevelTop();
         void increaseZlevelBottom();
 
+        void onZoomChanged();
+
     protected:
         virtual void buildButtons();
         virtual void decorateMenu(QMenu *menu);