The attached diff makes ebuild show elog message requesting evince installation for getting print preview only when it's not installed Thanks :-) Reproducible: Always
Created attachment 164465 [details] gtk.diff
in fact learned recently (but it seems other were well aware before that) that this is something the user can change by himself in .gtkrc-2.0 so the string actualy needs fixing but also needs be showed all the time.
updated the comment to reflect knowledge of gtk-print-preview-command and make sure the message is present since 2.10 releases. Closing.
I don't agree on the necessity of showing it all the time. If evince is there, we can be quite sure that print preview works - either it uses the default (evince), or the user has changed it via gtkrc, in which case it should be working as well as the user is assumed to know what he's doing and what he's setting and keeping that package around