Fix folio auto-num context not applying to the active diagram

BorderTitleBlock::slot_setAutoPageNum was removed in 471f876 ("Remove unused signal", 2023-10-17) without noticing autonumberingdockwidget.cpp still referenced it via old-style
SIGNAL()/SLOT() macros, which fail silently at runtime instead of producing a compile error. This has remained broken on master ever since; a fix (57572a2, "Fix two broken signal
connections") exists on the unmerged qt6-cmake-elevatormind-merged branch but that one only commented the lines out without solving the underlying issue.

Removed the dead code entirely and call BorderTitleBlock::importTitleBlock() directly on the active diagram in on_m_folio_cb_activated() instead. The same mechanism is already
used elsewhere in the codebase (undo command, new-diagram creation, XML loading) to push TitleBlockProperties into a diagram and trigger a folio numbering recompute via needFolioData().

sources/autoNum/ui/autonumberingdockwidget.cpp

@@ -107,10 +107,6 @@ void AutoNumberingDockWidget::setProject(QETProject *project,
 			    this,SLOT(folioAutoNumChanged()));
 		disconnect (m_project,SIGNAL(folioAutoNumAdded()),
 			    this,SLOT(folioAutoNumChanged()));
-		disconnect (this,
-			    SIGNAL(folioAutoNumChanged(QString)),
-			    &m_project_view->currentDiagram()->diagram()->border_and_titleblock,
-			    SLOT (slot_setAutoPageNum(QString)));
 		disconnect(m_project, SIGNAL(defaultTitleBlockPropertiesChanged()),
 			   this,SLOT(setActive()));
 	
@@ -146,10 +142,6 @@ void AutoNumberingDockWidget::setProject(QETProject *project,
 		 this,SLOT(folioAutoNumChanged()));
 	connect (m_project,SIGNAL(folioAutoNumAdded()),
 		 this,SLOT(folioAutoNumChanged()));
-	connect (this,
-		 SIGNAL(folioAutoNumChanged(QString)),
-		 &m_project_view->currentDiagram()->diagram()->border_and_titleblock,
-		 SLOT (slot_setAutoPageNum(QString)));
 	connect(m_project, SIGNAL(defaultTitleBlockPropertiesChanged()),
 		this,SLOT(setActive()));
 
@@ -345,7 +337,9 @@ void AutoNumberingDockWidget::on_m_folio_cb_activated(int) {
 		ip.folio = "%id/%total";
 		m_project->setDefaultTitleBlockProperties(ip);
 	}
-		emit(folioAutoNumChanged(current_autonum));
+	if (m_project_view && m_project_view->currentDiagram()) {
+		m_project_view->currentDiagram()->diagram()->border_and_titleblock.importTitleBlock(ip);
+	}
 	refreshValueField(ui->m_folio_cb, ui->m_folio_value_le, AutoNumCategory::Folio);
 }
 

sources/autoNum/ui/autonumberingdockwidget.h

@@ -66,8 +66,6 @@ class AutoNumberingDockWidget : public QDockWidget
 		void on_m_element_value_le_editingFinished();
 		void on_m_folio_value_le_editingFinished();
 
-	signals:
-		void folioAutoNumChanged(QString);
 
 	private:
 		enum class AutoNumCategory { Conductor, Element, Folio };