Current desktop specification does not allow "OnlyShowIn=X-MyDesktopSystem". It complicates writing of new desktop systems, because authors must first change specification to add their desktop to "approved" list. I propose to add following sentence to specification of OnlyShowIn and NotShowIn. Categories not in this document must be prefixed by the string "X-" indicating that they are extensions. Categories are case-sensitive.
Yep, we'll do this. I'll commit the change once I get a few minutes to handle this. (It's in the menu spec, IIRC).
Fixed in HEAD.
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