bug#38485: Customizing glyph widths

[Eli Zaretskii]

> Cc: casouri@gmail.com, 38485@debbugs.gnu.org
> From: Clément Pit-Claudel <cpitclaudel@gmail.com>
> Date: Wed, 4 Dec 2019 15:55:38 -0500
> 
> Another example: the nameless-mode pacakge uses prettification to display the 
> name of the current file as :, so that in foo-bar.el the symbol foo-bar-xyz 
> displays as :xyz (with a different color for the colon) to shorten lines and 
> improve readability.  Widening this ':' would defeat the purpose of that 
> package.

That's why I suggest a buffer-local variable.  This package should not
set it, then.

And anyway, trying to lump too many conflicting requirements is likely
to have only one result: that this will never get implemented.