Beautified the settings dialog

Double-clicking a folder in the behaves like open folder


FossilOrigin-Name: 8a4fbbb14628b2dc53b8d46a35a3b4f43182db9c

MainWindow.h

@@ -191,6 +191,7 @@ private slots:
 	void on_actionHistory_triggered();
 	void on_actionClearLog_triggered();
 	void on_tableView_doubleClicked(const QModelIndex &index);
+	void on_treeView_doubleClicked(const QModelIndex &index);
 	void on_actionOpenFile_triggered();
 	void on_actionPush_triggered();
 	void on_actionPull_triggered();