Move color to TimelineMarker and make sure all instances of a marker update on color change

app/widget/marker/marker.cpp

@@ -78,7 +78,7 @@ void Marker::ShowContextMenu() {
 
   // Color menu
   ColorLabelMenu color_coding_menu;
-  connect(&color_coding_menu, &ColorLabelMenu::ColorSelected, this, &Marker::SetColor);
+  connect(&color_coding_menu, &ColorLabelMenu::ColorSelected, this, &Marker::ColorChanged);
   m.addMenu(&color_coding_menu);
 
   m.exec(QCursor::pos());

app/widget/marker/marker.h

@@ -34,6 +34,9 @@ class Marker : public QWidget {
  public:
   Marker(QWidget* parent = nullptr);
 
+ public slots:
+  void SetColor(int c);
+
  protected:
   void paintEvent(QPaintEvent* event) override;
   //virtual void mouseReleaseEvent(QMouseEvent* event) override;
@@ -42,6 +45,7 @@ class Marker : public QWidget {
  signals:
   //void MouseClicked();
   //void MouseDoubleClicked();
+  void ColorChanged(int c);
 
  private:
 
@@ -49,7 +53,6 @@ class Marker : public QWidget {
 
  private slots:
   void ShowContextMenu();
-  void SetColor(int c);
 };
 
 }  // namespace olive

app/widget/timeruler/seekablewidget.cpp

@@ -143,6 +143,9 @@ void SeekableWidget::addMarker(TimelineMarker* marker)
     Marker *marker_widget = new Marker(this);
     marker_map_.insert(marker, marker_widget);
 
+    connect(marker_widget, &Marker::ColorChanged, marker, &TimelineMarker::set_color);
+    connect(marker, &TimelineMarker::ColorChanged, marker_widget, &Marker::SetColor);
+
     marker_widget->move(TimeToScreen(marker->time().in()), 20);
     marker_widget->show();
   }