scrolling update

panels/timeline.cpp

@@ -752,11 +752,11 @@ QVector<int> Timeline::get_tracks_of_linked_clips(int i) {
 }
 
 void Timeline::zoom_in() {
-    multiply_zoom(true);
+    multiply_zoom(2.0);
 }
 
 void Timeline::zoom_out() {
-    multiply_zoom(false);
+    multiply_zoom(0.5);
 }
 
 bool is_clip_selected(Clip* clip, bool containing) {

panels/timeline.h

@@ -232,9 +232,10 @@ public slots:
 
     void nest();
 
+    void zoom_in();
+    void zoom_out();
+
 private slots:
-	void zoom_in();
-	void zoom_out();
 	void snapping_clicked(bool checked);
 	void add_btn_click();
 	void add_menu_item(QAction*);