GNU bug report logs - #23806
24.5; can not set line height

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#23806: closed (24.5; can not set line height)
Date: Tue, 21 Jun 2016 14:26:02 +0000

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Your message dated Tue, 21 Jun 2016 17:24:54 +0300
with message-id <83bn2u7h6x.fsf <at> gnu.org>
and subject line Re: bug#23806: 24.5; can not set line height
has caused the debbugs.gnu.org bug report #23806,
regarding 24.5; can not set line height
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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From: ynyaaa <at> gmail.com
To: bug-gnu-emacs <at> gnu.org
Subject: 24.5; can not set line height
Date: Mon, 20 Jun 2016 11:15:11 +0900

`line-height' property is effective only at the newlines,
so there are no chances to set line height
  (1) when the line is wrapped
  (2) when the line is truncated
  (3) when the line is at the bottom of a buffer
        and not terminated by newline



In GNU Emacs 24.5.1 (i686-pc-mingw32)
 of 2015-04-11 on LEG570
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 `configure --prefix=/c/usr --host=i686-pc-mingw32'

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Memory information:
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From: Eli Zaretskii <eliz <at> gnu.org>
To: ynyaaa <at> gmail.com
Cc: 23806-done <at> debbugs.gnu.org
Subject: Re: bug#23806: 24.5; can not set line height
Date: Tue, 21 Jun 2016 17:24:54 +0300

> From: ynyaaa <at> gmail.com
> Cc: 23806 <at> debbugs.gnu.org
> Date: Tue, 21 Jun 2016 10:45:10 +0900
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > The node "Line Height" in the ELisp manual describes the line-spacing
> > variable and frame parameter, which are more general-purpose ways of
> > controlling vertical layout of text.
> 
> The manual also describes the line-spacing property at the newlines,
> which has same problems as the line-height property.

Yes, and its documentation also refers to a "display line".

> I want to use the line-height property because the line-spacing variable
> can not affect partial buffer contents

What do you mean by "partial buffer contents"?

> and can not add spacing both above and below lines.

Such an extension could be added.

> By the way it is written in the manual,
>        If the property value is a list of the form ‘(HEIGHT TOTAL)’,
>     (snip) In
>     this case, the other ways to specify the line spacing are ignored.
> 
> Setting the line-height property to '(1.0 1.0) ignores the line-spacing
> property, but the line-spacing variable or frame parameter takes effect.
> 
> Setting the line-height property to 't ignores the line-spacing
> property, this behavior is not documented.

It's documented, sort of, by saying that only the visible content
determines the line height in this case.  But I made that more
explicit.

> In the manual:
>        Finally, a newline can have a ‘line-spacing’ text or overlay property
>     that overrides the default frame line spacing and the buffer local
>     ‘line-spacing’ variable, for the display line ending in that newline.
> 
> The line-spacing property overrides the line-spacing variable or frame
> parameter only if the property value is bigger.

Actually, it doesn't override, but compared, and the largest value
used instead.

I fixed these inaccuracies, and I'm marking the bug done.

Thanks.

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