Index: /trunk/src/org/openstreetmap/josm/tools/AutoCompleteComboBox.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/tools/AutoCompleteComboBox.java	(revision 740)
+++ /trunk/src/org/openstreetmap/josm/tools/AutoCompleteComboBox.java	(revision 741)
@@ -39,5 +39,5 @@
 			if(selecting || (offs == 0 && str.equals(getText(0, getLength()))))
 				return;
-			boolean initial = (offs == 0 && getLength() == 0);
+			boolean initial = (offs == 0 && getLength() == 0 && str.length() > 1);
 			super.insertString(offs, str, a);