Index: trunk/src/org/openstreetmap/josm/gui/MapView.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/MapView.java	(revision 11070)
+++ trunk/src/org/openstreetmap/josm/gui/MapView.java	(revision 11071)
@@ -460,4 +460,7 @@
         Set<MapViewPaintable> invalidated = invalidatedListener.collectInvalidatedLayers();
         for (Layer l: visibleLayers) {
+            // `isChanged` for backward compatibility, see https://josm.openstreetmap.de/ticket/13175#comment:7
+            // Layers that still implement it (plugins) will use it to tell the MapView that they have been changed.
+            // This is why the MapView still uses it in addition to the invalidation events.
             if (l.isChanged() || invalidated.contains(l)) {
                 break;