Summary says it all..
Created attachment 105545 [details, diff] xfce4-notes-asneeded.patch One bottle of beer in the wall..
Created attachment 105546 [details] xfce4-notes-1.4.ebuild Two bottles of beer in the wall..
FYI, it's typically more useful to attach diffs if you're modifying existing ebuilds. This makes it much easier to determine what changes you are suggesting. This is a really simple change here, but it's good form in general.
Upstream bug, http://bugzilla.xfce.org/show_bug.cgi?id=2732
Fixed in upstream trunk.
Thanks for reporting!