introduce shortcut ctrl+s which trigers on_actionSave_triggered() (#140)

Author: fmros

bt_editor/mainwindow.cpp

@@ -126,6 +126,8 @@ MainWindow::MainWindow(GraphicMode initial_mode, QWidget *parent) :
     QShortcut* redo_shortcut = new QShortcut(QKeySequence(Qt::CTRL + Qt::SHIFT + Qt::Key_Z), this);
     connect( redo_shortcut, &QShortcut::activated, this, &MainWindow::onRedoInvoked );
 
+    QShortcut* save_shortcut = new QShortcut(QKeySequence(Qt::CTRL + Qt::Key_S), this);
+
     connect( _editor_widget, &SidepanelEditor::nodeModelEdited,
             this, &MainWindow::onTreeNodeEdited);
 
@@ -176,6 +178,8 @@ MainWindow::MainWindow(GraphicMode initial_mode, QWidget *parent) :
     connect( ui->toolButtonSaveFile, &QToolButton::clicked,
             this, &MainWindow::on_actionSave_triggered );
 
+    connect( save_shortcut, &QShortcut::activated, this, &MainWindow::on_actionSave_triggered );
+
     connect( _replay_widget, &SidepanelReplay::changeNodeStyle,
             this, &MainWindow::onChangeNodesStatus);