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 Content preview:  The manual says: =?UTF-8?Q?=E2=80=98line-height=E2=80=99_?= =?UTF-8?Q?=C2=A0_?= =?UTF-8?Q?=C2=A0_?= =?UTF-8?Q?=C2=A0A?= newline can have
    a =?UTF-8?Q?=E2=80=98line-height=E2=80=99?= text or overlay property that =?UTF-8?Q?=C2=A0_?= =?UTF-8?Q?=C2=A0_?= =?UTF-8?Q?=C2=A0controls?= the total
    height of the display line ending in that =?UTF-8?Q?=C2=A0_?= =?UTF-8?Q?=C2=A0_?= =?UTF-8?Q?=C2=A0newline._?= =?UTF-8?Q?=C2=A0*Note?= Line Height
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------=_Part_106236_677907669.1586353378589
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

The manual says:

=E2=80=98line-height=E2=80=99
=C2=A0 =C2=A0 =C2=A0A newline can have a =E2=80=98line-height=E2=80=99 text=
 or overlay property that
=C2=A0 =C2=A0 =C2=A0controls the total height of the display line ending in=
 that
=C2=A0 =C2=A0 =C2=A0newline. =C2=A0*Note Line Height::.

If you set this for a bunch of lines then it properly adds spacing to those=
 lines.

But if you have long lines in the buffer and =C2=A0 (setq truncate-lines t)=
 then=C2=A0
all lines will be properly spaced, except for the long lines, because the=
=C2=A0
newline is out of screen.

Even if the newline is not on screen, it should affect the height of the tr=
uncated=C2=A0
line, because that's why the package developer added line-height to the new=
line,
so the=C2=A0 line has some spacing.
=C2=A0
=C2=A0
------=_Part_106236_677907669.1586353378589
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

The manual says:<br />
<br />
&#8216;line-height&#8217;<br />
&#160; &#160; &#160;A newline can have a &#8216;line-height&#8217; text or overlay property that<br />
&#160; &#160; &#160;controls the total height of the display line ending in that<br />
&#160; &#160; &#160;newline. &#160;*Note Line Height::.<br />
<br />
If you set this for a bunch of lines then it properly adds spacing to those lines.<br />
<br />
But if you have long lines in the buffer and &#160; (setq truncate-lines t) then&#160;<br />
all lines will be properly spaced, except for the long lines, because the&#160;<br />
newline is out of screen.<br />
<br />
Even if the newline is not on screen, it should affect the height of the truncated&#160;<br />
line, because that&#39;s why the package developer added line-height to the newline,<br />
so the&#160; line has some spacing.<br />
&#160;<br />
&#160;
------=_Part_106236_677907669.1586353378589--




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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: ndame <emacsuser@HIDDEN>
Subject: bug#40507: Acknowledgement (26.2; truncate-lines does not respect
 line-height)
Message-ID: <handler.40507.B.15863538909488.ack <at> debbugs.gnu.org>
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Subject: bug#40507: 26.2; truncate-lines does not respect line-height
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severity 40507 wishlist
thanks

> From: ndame <emacsuser@HIDDEN>
> Date: Wed,  8 Apr 2020 15:51:09 +0200 (CEST)
> 
> Even if the newline is not on screen, it should affect the height of the truncated 
> line, because that's why the package developer added line-height to the newline,
> so the  line has some spacing.

That's not what this feature was designed for.  It is conceptually the
same as having a character in a line whose height is greater than
those of others: the line's hight will be increased only if that
taller character is displayed.

The line-height property you put on a newline is basically a means to
force the newline character have some specified height, even though
the newline doesn't have a glyph with a definite metrics.  That's why
this property is placed on a newline, not on any other character.

In terms of the implementation, the feature you expected would require
the display engine consider characters that are not visible in the
window, something that the display code tries hard to avoid doing (so
it could be faster).




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Subject: Re: bug#40507: 26.2; truncate-lines does not respect line-height
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severity 40507 wishlist
thanks

> From: ndame <emacsuser@HIDDEN>
> Date: Wed,  8 Apr 2020 15:51:09 +0200 (CEST)
> 
> Even if the newline is not on screen, it should affect the height of the truncated 
> line, because that's why the package developer added line-height to the newline,
> so the  line has some spacing.

That's not what this feature was designed for.  It is conceptually the
same as having a character in a line whose height is greater than
those of others: the line's hight will be increased only if that
taller character is displayed.

The line-height property you put on a newline is basically a means to
force the newline character have some specified height, even though
the newline doesn't have a glyph with a definite metrics.  That's why
this property is placed on a newline, not on any other character.

In terms of the implementation, the feature you expected would require
the display engine consider characters that are not visible in the
window, something that the display code tries hard to avoid doing (so
it could be faster).




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------=_Part_106541_995734024.1586356012958
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

> In terms of the implementation, the feature you expected would require
> the display engine consider characters that are not visible in the
> window, something that the display code tries hard to avoid doing (so
> it could be faster).

I understand there can be performance implications. It may be worth some
additional lines in the manual that it has an effect only if the newline is=
=C2=A0
actually on the screen. (Maybe obvious, but I expected it to have an effect=
.)

And also the workaround could be mentioned that the user can place a=C2=A0
display line-height property to some other character on the line (preferabl=
y
a space, so it doesn't affect the text appearance) which has the same effec=
t.
------=_Part_106541_995734024.1586356012958
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

&#62; In terms of the implementation, the feature you expected would require<br />
&#62; the display engine consider characters that are not visible in the<br />
&#62; window, something that the display code tries hard to avoid doing (so<br />
&#62; it could be faster).<br />
<br />
I understand there can be performance implications. It may be worth some<br />
additional lines in the manual that it has an effect only if the newline is&#160;<br />
actually on the screen. (Maybe obvious, but I expected it to have an effect.)<br />
<br />
And also the workaround could be mentioned that the user can place a&#160;<br />
display line-height property to some other character on the line (preferably<br />
a space, so it doesn&#39;t affect the text appearance) which has the same effect.
------=_Part_106541_995734024.1586356012958--





Last modified: Wed, 8 Apr 2020 14:45:02 UTC

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.