started work on nesting function

mainwindow.cpp

@@ -888,3 +888,40 @@ void MainWindow::on_actionEdit_to_In_Point_triggered() {
 void MainWindow::on_actionEdit_to_Out_Point_triggered() {
 	if (panel_timeline->focused()) panel_timeline->ripple_to_in_point(false, false);
 }
+
+void MainWindow::on_actionNest_triggered() {
+	/*
+	if (sequence != NULL) {
+		QVector<Clip*> selected_clips;
+		long earliest_point = LONG_MAX;
+		for (int i=0;i<sequence->clips.size();i++) {
+			Clip* c = sequence->clips.at(i);
+			if (c != NULL && panel_timeline->is_clip_selected(c, true)) {
+				selected_clips.append(c);
+				earliest_point = qMin(c->timeline_in, earliest_point);
+
+				sequence->clips[i] = NULL; // make undoable
+			}
+		}
+		if (!selected_clips.isEmpty()) {
+			Sequence* s = new Sequence();
+
+			s->name = "NEST";
+			s->width = sequence->width;
+			s->height = sequence->height;
+			s->frame_rate = sequence->frame_rate;
+			s->audio_frequency = sequence->audio_frequency;
+			s->audio_layout = sequence->audio_layout;
+
+			for (int i=0;i<selected_clips.size();i++) {
+				Clip* c = selected_clips.at(i);
+				s->clips.append(c);
+			}
+
+			ComboAction* ca = new ComboAction();
+			panel_project->new_sequence(ca, s, true, NULL);
+			undo_stack.push(ca);
+		}
+	}
+	*/
+}

mainwindow.h

@@ -197,6 +197,8 @@ private slots:
 
 	void on_actionEdit_to_Out_Point_triggered();
 
+	void on_actionNest_triggered();
+
 private:
 	Ui::MainWindow *ui;
 	void setup_layout();

mainwindow.ui

@@ -99,6 +99,7 @@
     <addaction name="separator"/>
     <addaction name="actionSet_Edit_Marker"/>
     <addaction name="actionEnable_Disable_Clip"/>
+    <addaction name="actionNest"/>
    </widget>
    <widget class="QMenu" name="menuWindow">
     <property name="title">
@@ -842,6 +843,11 @@
     <string>Ctrl+Alt+W</string>
    </property>
   </action>
+  <action name="actionNest">
+   <property name="text">
+    <string>Nest</string>
+   </property>
+  </action>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
  <resources/>

ui/timelinewidget.cpp

@@ -92,9 +92,8 @@ void TimelineWidget::show_context_menu(const QPoint& pos) {
 		}
 	}
 
-	if (selected_clips.size() == 0) {
+	if (selected_clips.isEmpty()) {
 		// no clips are selected
-
 		panel_timeline->cursor_frame = panel_timeline->getTimelineFrameFromScreenPoint(pos.x());
 		panel_timeline->cursor_track = getTrackFromScreenPoint(pos.y());