- for (PointSelection::iterator i = selection->points.begin(); i != selection->points.end(); ++i) {
- boost::shared_ptr<AutomationList> al = (*i)->line().the_list();
- al->erase ((*i)->model ());
+ for (PointSelection::iterator sel_point = selection->points.begin(); sel_point != selection->points.end(); ++sel_point) {
+ AutomationLine& line = (*sel_point)->line ();
+ boost::shared_ptr<AutomationList> al = line.the_list();
+
+ bool erase = true;
+
+ if (dynamic_cast<AudioRegionGainLine*> (&line)) {
+ /* removing of first and last gain point in region gain lines is prohibited*/
+ if (line.is_last_point (*(*sel_point)) || line.is_first_point (*(*sel_point))) {
+ erase = false;
+ }
+ }
+
+ if(erase) {
+ al->erase ((*sel_point)->model ());
+ }