merged with master

panels/panels.cpp

@@ -111,6 +111,10 @@ void free_panels() {
 }
 
 void scroll_to_frame_internal(QScrollBar* bar, long frame, double zoom, int area_width) {
+  if (bar->value() == bar->minimum() || bar->value() == bar->maximum()) {
+    return;
+  }
+
   int screen_point = getScreenPointFromFrame(zoom, frame) - bar->value();
   int min_x = area_width*0.1;
   int max_x = area_width-min_x;