bug#43506: 26.1; line-height sometimes has no effect on the line height

[Markus Triska <triska@metalevel.at>]

Eli Zaretskii <eliz@gnu.org> writes:

>      There are several ways to explicitly specify a larger line height,
>   either by specifying an absolute height for the display line, or by
>   specifying vertical space.  However, no matter what you specify, the
>   actual line height can never be less than the default.

I find that this is not the case: For example, if I change "3" to "t" in
the snippet I posted, then I get "0" in the minibuffer, indicating that
the line height can become as low as 0 by using this property.

> IOW, this property can only enlarge the line's height, which is
> confirmed by the fact that using 300 in your example does work as
> expected.

Please see above: The property seems to be usable to get very small line
heights too. However, it does not seem to work for integers.

> The documentation already mentions the limitations, see above.

The limitations seem not to be correctly documented at the moment.

Thank you and all the best,
Markus