There is currently no way to hide a .desktop file from both menu in desktop environment AND menu editors (NoDisplay only hides in desktop environment). Using OnlyShowIn=; is not considered as valid by latest version of desktop-file-validate. So, we should either enable this case or add a None keyword (or X-None for backward compatibility maybe).
Sorry for the noise, reassigning to new (since 2 years) maintainers (Ryan & David).
Well, one can use Hidden=true to hide from *everything*, but I suppose you still wanted the mime-apps association to work... I'm OK with adding support for OnlyShowIn=, but I need a patch for desktop-file-utils. (I just checked and OnlyShowIn=; should work without modifications in the KDE implementation.)
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