Fix a folio report pointing back at its partner's old place after its information changes

A folio report's label shows where its partner is (updateReportText()).
Changing any other information of the report -- a comment, a function --
ran elementInfoChanged(), which set the text from the label stored in
the report's information instead: the partner's position when the file
was last saved. Move the partner from column 4 to column 9, give the
report a comment, and it showed (and saved) 1-C4 again.

With lazy folios the partner is often built after the change, so the
report was recomputed and the two modes saved different files; that is
how this was found (FINDINGS F116, tools/lazy-folios/edit-diff.py).

New tst_reporttextafterinfo: move the partner, comment the report, save,
check the report says 1-C9, with folios built when needed and with every
folio built. Both rows fail without this change ("1-C4").

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

sources/qetgraphicsitem/dynamicelementtextitem.cpp

@@ -1098,6 +1098,19 @@ void DynamicElementTextItem::handlerMouseReleaseEvent(QetGraphicsHandlerItem *ha
 
 void DynamicElementTextItem::elementInfoChanged()
 {
+		//A folio report's label shows where its partner is
+		//(updateReportText()); the label in its information is only where
+		//the partner was when last saved, and changing any other
+		//information wrote that stale position back (F116)
+	if (m_text_from == ElementInfo && m_info_name == QLatin1String("label")
+			&& m_parent_element && (m_parent_element.data()->linkType() & Element::AllReport)
+			&& m_other_report) {
+		setupFormulaConnection();
+		updateReportText();
+		emit plainTextChanged();
+		return;
+	}
+
 	DiagramContext dc;
 	Element *element = elementUseForInfo();
 	if(element) {