Reapply "Add cable management: drawing, cores, numbering, cross-references and cable list"

This reverts commit 2bb3343d2d.

sources/autoNum/ui/pastenumberingimport.cpp

@@ -37,22 +37,41 @@ QList<ElementAutoNumSchemeCommand::Scheme> PasteNumberingImport::copiedBy(const
 	elements follow and the project does not have.
 	@param parent : parent of the question
 	@param copied : the numberings the copy carries
+	@param extra : commands the copy brings beside the paste itself
+	(the cable lines of a fragment, for example); they are pushed inside
+	the same macro, so one Ctrl+Z undoes all of it at once.
 */
 void PasteNumberingImport::push(QWidget *parent,
 								Diagram *diagram,
 								const DiagramContent &content,
-								const QList<ElementAutoNumSchemeCommand::Scheme> &copied)
+								const QList<ElementAutoNumSchemeCommand::Scheme> &copied,
+								const QList<QUndoCommand *> &extra)
 {
 	QETProject *project = diagram->project();
 	auto *paste = new PasteDiagramCommand(diagram, content);
 
+		//The paste and the commands beside it are one step: only the
+		//macros really need more than the single push.
+	const auto push_all = [&]() {
+		if (extra.isEmpty()) {
+			diagram->undoStack().push(paste);
+			return;
+		}
+		diagram->undoStack().beginMacro(paste->text());
+		diagram->undoStack().push(paste);
+		for (QUndoCommand *cmd : extra) {
+			diagram->undoStack().push(cmd);
+		}
+		diagram->undoStack().endMacro();
+	};
+
 	QList<ElementAutoNumSchemeCommand::Scheme> missing;
 	if (project && !copied.isEmpty()
 			&& QSettings().value("diagramcommands/autonumber-pasted-elements", true).toBool()) {
 		missing = ElementAutoNumSchemeCommand::missingForPaste(project, copied, content.m_elements);
 	}
 	if (missing.isEmpty()) {
-		diagram->undoStack().push(paste);
+		push_all();
 		return;
 	}
 
@@ -71,7 +90,7 @@ void PasteNumberingImport::push(QWidget *parent,
 				QMessageBox::Yes | QMessageBox::No,
 				QMessageBox::Yes);
 	if (answer != QMessageBox::Yes) {
-		diagram->undoStack().push(paste);
+		push_all();
 		return;
 	}
 
@@ -91,5 +110,8 @@ void PasteNumberingImport::push(QWidget *parent,
 		}
 	}
 	diagram->undoStack().push(paste);
+	for (QUndoCommand *cmd : extra) {
+		diagram->undoStack().push(cmd);
+	}
 	diagram->undoStack().endMacro();
 }