added autoscrolling when seeking the timeline

panels/timeline.cpp

@@ -475,6 +475,19 @@ void Timeline::select_all() {
 	}
 }
 
+void Timeline::scroll_to_frame(long frame) {
+	if (sequence != NULL) {
+		int screen_point = getTimelineScreenPointFromFrame(frame);
+		int min_x = timeline_area->width()*0.1;
+		int max_x = timeline_area->width()*0.9;
+		if (screen_point < min_x) {
+			horizontalScrollBar->setValue(getScreenPointFromFrame(zoom, frame) - min_x);
+		} else if (screen_point > max_x) {
+			horizontalScrollBar->setValue(getScreenPointFromFrame(zoom, frame) - max_x);
+		}
+	}
+}
+
 void Timeline::resizeEvent(QResizeEvent *event) {
 	if (sequence != NULL) set_sb_max();
 }

panels/timeline.h

@@ -203,6 +203,8 @@ public:
 	QPushButton* toolTransitionButton;
 	QPushButton* snappingButton;
 
+	void scroll_to_frame(long frame);
+
 	void resizeEvent(QResizeEvent *event);
 public slots:
 	void repaint_timeline();

panels/viewer.cpp

@@ -237,6 +237,7 @@ bool frame_rate_is_droppable(float rate) {
 void Viewer::seek(long p) {
 	pause();
 	seq->playhead = p;
+	if (main_sequence) panel_timeline->scroll_to_frame(p);
 	update_parents();
 	reset_all_audio();
 	audio_scrub = true;