Merge pull request openlayers#6606 from ahocevar/delete-segmentdata

Reset dragSegments after vertex deletion

src/ol/interaction/modify.js

@@ -1088,6 +1088,7 @@ ol.interaction.Modify.prototype.removeVertex_ = function() {
         this.overlay_.getSource().removeFeature(this.vertexFeature_);
         this.vertexFeature_ = null;
       }
+      dragSegments.length = 0;
     }
 
   }