bug#40857: Invisibility specs do not apply to specified spaces

[Eli Zaretskii]

> Cc: 40857@debbugs.gnu.org
> From: Clément Pit-Claudel <cpitclaudel@gmail.com>
> Date: Sun, 26 Apr 2020 13:25:09 -0400
> 
> > Ah, okay.  Didn't realize this was a feature request.
> 
> Sorry, it's because I wasn't clear.  Specified spaces are very convenient for 
> displaying tabulated lists, and the buffer-invisibility-spec is supposed to 
> be particularly useful for displaying database records, but in practice these 
> two don't work together.  It would be great if they did.

I still haven't abandon the hope that such feature requests will draw
volunteers other than myself...