Index: trunk/src/org/openstreetmap/josm/tools/WindowGeometry.java
===================================================================
--- trunk/src/org/openstreetmap/josm/tools/WindowGeometry.java	(revision 6529)
+++ trunk/src/org/openstreetmap/josm/tools/WindowGeometry.java	(revision 6530)
@@ -314,5 +314,5 @@
         }
 
-        int deltay = (p.x + size.height) - (virtualBounds.y + virtualBounds.height);
+        int deltay = (p.y + size.height) - (virtualBounds.y + virtualBounds.height);
         if (deltay > 0) {
             size.height -= deltay;