bug#64166: 29.0.92; A :box with negative vertical width does not avoid any increase in the line height

[Eli Zaretskii]

tags 64166 notabug
close 64166
thanks

> From: Sebastian Miele <iota@whxvd.name>
> Cc: 64166@debbugs.gnu.org
> Date: Tue, 20 Jun 2023 18:12:25 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> At the end of the second line, evaluate (‘eval-expression’):
> >> 
> >>   (insert (propertize "text" 'face '(:box '(:line-width (-1 . -1)))))
> >> 
> >> The height of the line clearly changes.  But that is contrary to what
> >> the manual says about the ‘:box’ face attribute:
> >> 
> >>   "A negative horizontal or vertical width −N means to draw a line of
> >>   width N that occupies the space of the underlying text, thus avoiding
> >>   any increase in the character height or width."
> >
> > The above is incorrect face specification.  Try this instead:
> >
> >   (insert (propertize "text" 'face '(:box (:line-width (-1 . -1)))))
> >
> >> Apart from that:
> >> 
> >> (1) Using ‘:line-width (-1 . -1)’ seems to yield the exact same result
> >> as ‘:line-width (1 . 1)’ does, both in width and in height.
> >> 
> >> (2) Using even larger negative values has no effect.
> >> ‘:line-width (-10 . -10)’ also seems to yield the exact same result as
> >> ‘:line-width (1 . 1)’ does.
> >> 
> >> Apparantly, all negative values are treates as positive 1, contrary to
> >> what the manual states.
> >
> > What happens if you remove the redundant quote?
> 
> Everything works as expected.  Sorry for the noise.

No sweat, I'm therefore closing the bug.