GNU bug report logs - #43506
26.1; line-height sometimes has no effect on the line height

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Message #22 received at 43506 <at> debbugs.gnu.org (full text, mbox):

From: Markus Triska <triska <at> metalevel.at>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 43506 <at> debbugs.gnu.org
Subject: Re: bug#43506: 26.1;
 line-height sometimes has no effect on the line height
Date: Sat, 19 Sep 2020 13:43:53 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

> The value t is not a valid value for the line-height property.  So you
> are invoking "unspecified behavior" here by using it.

This is very surprising to read, because the documentation itself states:

        If the property value is ‘t’, the newline character has no effect on
    the displayed height of the line—the visible contents alone determine   
    the height.

Is it indeed true that t is not a valid value for the line-height property?

In one of my applications, I am using the t property to ensure that
adding a newline does not increase the line height in any way, and I
would prefer if this behaviour is retained also in future Emacs versions.

> The limitations are documented; what happens when you use invalid
> values isn't (and doesn't have to be).

What is documented seems to contradict what I observe, and also what the
documentation itself states in other places.

All the best,
Markus

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