void defer_timer_expired();
void content_changed(); // In clip_list or play_list.
void state_changed(const StateProto &state); // Called post-filtering.
+ void save_settings();
enum Rounding { FIRST_AT_OR_AFTER, LAST_BEFORE };
void preview_single_frame(int64_t pts, unsigned stream_idx, Rounding rounding);
void about_triggered();
void undo_triggered();
void redo_triggered();
+ void quality_toggled(int quality, bool checked);
void highlight_camera_input(int stream_idx);