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bug#50178: 28.0.50; Size of echo area does not account for line-spacing
From: |
Óscar Fuentes |
Subject: |
bug#50178: 28.0.50; Size of echo area does not account for line-spacing |
Date: |
Wed, 25 Aug 2021 12:49:39 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
martin rudalics <rudalics@gmx.at> writes:
>>> It must know and handle every setting that affects line height, current
>>> and future. It would be handy if Emacs provided a function that does
>>> that.
>>
>> We already have it: window-text-pixel-size.
>
> To elaborate:
>
> (1) You first have to calculate the maximum permissible pixel height of
> the echo area window from the character height of the frame where
> you intend to display the completions and the value of
> `max-mini-window-height' height as specified for that frame. Note
> that for a minibuffer-less frame the echo area window may appear on
> another frame whose character height you have to use here.
>
> (2) You then have to calculate the pixel height of each completion line
> as if it were shown in the echo area window mentioned in (1) using
> `window-text-pixel-size' and add it to some cumulative height until
> you have exhausted the maximum permissible height calculated in (1).
Thanks. That's too complicated and looks like there are quite a bit of
hidden traps, so for the time being I'll set line-spacing to nil.
On true pixel-oriented systems there are APIs for querying the display
engine about several metrics. Then you can place the text at certain
pixel coordinates. Emacs, however, is a Frankenstein system, that uses
pixels (on graphic frames) but the text positioning depends on previous
text, i.e. for vertical positioning it is a line-based, not pixel-based,
system. Therefore, when you just need to output some lines, you must
deal with pixels, translate back to lines and, to add insult to injury,
resort to post-facto information.
As useful as it would be an API that returns how many lines fit on a
given window. Or, on this case, max-mini-window-height being a true
indication of the capacity of the mini window on terms of the current
display settings, which is what the users want 99.9% of the time.
Closing.
- bug#50178: 28.0.50; Size of echo area does not account for line-spacing, (continued)
- bug#50178: 28.0.50; Size of echo area does not account for line-spacing, Óscar Fuentes, 2021/08/24
- bug#50178: 28.0.50; Size of echo area does not account for line-spacing, Eli Zaretskii, 2021/08/24
- bug#50178: 28.0.50; Size of echo area does not account for line-spacing, Óscar Fuentes, 2021/08/24
- bug#50178: 28.0.50; Size of echo area does not account for line-spacing, Eli Zaretskii, 2021/08/24
- bug#50178: 28.0.50; Size of echo area does not account for line-spacing, Óscar Fuentes, 2021/08/24
- bug#50178: 28.0.50; Size of echo area does not account for line-spacing, Eli Zaretskii, 2021/08/24
- bug#50178: 28.0.50; Size of echo area does not account for line-spacing, Óscar Fuentes, 2021/08/24
- bug#50178: 28.0.50; Size of echo area does not account for line-spacing, Eli Zaretskii, 2021/08/24
- bug#50178: 28.0.50; Size of echo area does not account for line-spacing, martin rudalics, 2021/08/25
- bug#50178: 28.0.50; Size of echo area does not account for line-spacing, Gregory Heytings, 2021/08/25
- bug#50178: 28.0.50; Size of echo area does not account for line-spacing,
Óscar Fuentes <=
- bug#50178: 28.0.50; Size of echo area does not account for line-spacing, Eli Zaretskii, 2021/08/25
- bug#50178: 28.0.50; Size of echo area does not account for line-spacing, Gregory Heytings, 2021/08/25
- bug#50178: 28.0.50; Size of echo area does not account for line-spacing, Óscar Fuentes, 2021/08/25
- bug#50178: 28.0.50; Size of echo area does not account for line-spacing, Eli Zaretskii, 2021/08/25
- bug#50178: 28.0.50; Size of echo area does not account for line-spacing, Óscar Fuentes, 2021/08/25
- bug#50178: 28.0.50; Size of echo area does not account for line-spacing, Eli Zaretskii, 2021/08/26
- bug#50178: 28.0.50; Size of echo area does not account for line-spacing, martin rudalics, 2021/08/26
- bug#50178: 28.0.50; Size of echo area does not account for line-spacing, Eli Zaretskii, 2021/08/26