Use one file filter for opening a project

File > Open and Import numbering from a project each had their own
filter for .qet and .qetz, worded differently. Both use
QETProject::openFileFilter() now.

Review of #1472 (scorpio810, point 11).

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

sources/qetdiagrameditor.cpp

@@ -1828,7 +1828,7 @@ bool QETDiagramEditor::openProject()
 		this,
 		tr("Open a file"),
 		open_dialog_dir.absolutePath(),
-		tr("QElectroTech project(*.qet *.qetz);;XML Files (*.xml);;All files (*)")
+		QETProject::openFileFilter() + ";;" + tr("XML Files (*.xml);;All files (*)")
 	);
 	if (filepath.isEmpty()) return(false);
 

sources/qetproject.cpp

@@ -2654,6 +2654,15 @@ bool QETProject::isContainerPath(const QString &path)
 	return path.endsWith(QLatin1String(".qetz"), Qt::CaseInsensitive);
 }
 
+/**
+	@brief QETProject::openFileFilter
+	@return the file-dialog filter for a project to open: .qet and .qetz
+*/
+QString QETProject::openFileFilter()
+{
+	return tr("QElectroTech project (*.qet *.qetz)");
+}
+
 /**
 	@brief QETProject::writeContainer
 	Write the project document @p project to @p path as a .qetz: the same

sources/qetproject.h

@@ -455,6 +455,7 @@ class QETProject : public QObject
 		ProjectState openFile(QFile *file);
 	public:
 		static bool isContainerPath(const QString &path);
+		static QString openFileFilter();
 			/// Saving writes a .qetz: one read from a .qet is saved as
 			/// a .qetz beside it, the .qet left as it is
 			/// (stage D1)

sources/ui/configpage/projectconfigpages.cpp

@@ -1166,7 +1166,7 @@ void ProjectAutoNumConfigPage::importFromProject()
 				this,
 				tr("Import numbering from a project"),
 				m_project->currentDir(),
-				tr("Project QElectroTech (*.qet *.qetz)"));
+				QETProject::openFileFilter());
 	if (path.isEmpty()) {
 		return;
 	}