int modify_handles(double oldposition, double newposition,
int currentend, int edit_mode, int edit_edits, int edit_labels,
int edit_plugins, int edit_autos, Edits *trim_edits, int group_id);
int modify_handles(double oldposition, double newposition,
int currentend, int edit_mode, int edit_edits, int edit_labels,
int edit_plugins, int edit_autos, Edits *trim_edits, int group_id);