Index: /trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/MapCSSStyleSource.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/MapCSSStyleSource.java	(revision 7199)
+++ /trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/MapCSSStyleSource.java	(revision 7200)
@@ -385,4 +385,5 @@
         for (MapCSSRule r : matchingRuleIndex.getRuleCandidates(osm)) {
             env.clearSelectorMatchingInformation();
+            env.layer = r.selector.getSubpart();
             if (r.selector.matches(env)) { // as side effect env.parent will be set (if s is a child selector)
                 Selector s = r.selector;