Refresh the free text handles when the text comes back to a folio

itemChange() removed the corner handles when the text left the scene
but did not bring them back when it returned still selected, which Qt
allows (undoing a scripted delete does it) without a selection change.
Refresh on every scene change. The two handle helpers are protected:
nothing outside the class calls them.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

sources/qetgraphicsitem/diagramtextitem.cpp

@@ -365,17 +365,19 @@ void DiagramTextItem::focusOutEvent(QFocusEvent *event)
 
 /**
 	@brief DiagramTextItem::itemChange
-	Show or hide the resize handles with the selection.
+	Show or hide the resize handles with the selection and the scene.
 	@param change
 	@param value
 	@return
 */
 QVariant DiagramTextItem::itemChange(GraphicsItemChange change, const QVariant &value)
 {
-	if (change == QGraphicsItem::ItemSelectedHasChanged)
+		//Also when the text comes back to a scene: Qt keeps it selected
+		//across removeItem()/addItem() (undoing a delete) and sends no
+		//selection change, and its handles were removed with the scene.
+	if (change == QGraphicsItem::ItemSelectedHasChanged
+		|| change == QGraphicsItem::ItemSceneHasChanged)
 		refreshTextResizeHandles();
-	else if (change == QGraphicsItem::ItemSceneHasChanged && !scene())
-		removeTextResizeHandles();
 
 	return QGraphicsTextItem::itemChange(change, value);
 }

sources/qetgraphicsitem/diagramtextitem.h

@@ -91,10 +91,10 @@ class DiagramTextItem : public QGraphicsTextItem
 		void setPlainText(const QString &text);
 		bool isHtml() const;
 
+	protected:
 		void refreshTextResizeHandles();
 		TextResizeHandles *textResizeHandles() const {return m_resize_handles;}
 
-	protected:
 		void paint(QPainter *,
 			   const QStyleOptionGraphicsItem *,
 			   QWidget *) override;