Index: trunk/src/org/openstreetmap/josm/gui/tagging/TaggingPresetItems.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/tagging/TaggingPresetItems.java	(revision 7921)
+++ trunk/src/org/openstreetmap/josm/gui/tagging/TaggingPresetItems.java	(revision 7931)
@@ -1327,5 +1327,8 @@
     public static class MultiSelect extends ComboMultiSelect {
 
-        public long rows = -1;
+        /**
+         * Number of rows to display (positive integer, optional).
+         */
+        public String rows;
         protected ConcatenatingJList list;
 
@@ -1354,7 +1357,7 @@
             // if a number of rows has been specified in the preset,
             // modify preferred height of scroll pane to match that row count.
-            if (rows != -1) {
+            if (rows != null) {
                 double height = renderer.getListCellRendererComponent(list,
-                        new PresetListEntry("x"), 0, false, false).getPreferredSize().getHeight() * rows;
+                        new PresetListEntry("x"), 0, false, false).getPreferredSize().getHeight() * Integer.valueOf(rows);
                 sp.setPreferredSize(new Dimension((int) sp.getPreferredSize().getWidth(), (int) height));
             }