GNU bug report logs - #50178
28.0.50; Size of echo area does not account for line-spacing

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From: Gregory Heytings <gregory <at> heytings.org>
To: Óscar Fuentes <ofv <at> wanadoo.es>
Cc: martin rudalics <rudalics <at> gmx.at>, 50178-done <at> debbugs.gnu.org
Subject: bug#50178: 28.0.50; Size of echo area does not account for line-spacing
Date: Wed, 25 Aug 2021 14:33:35 +0000

>
> 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.
>

Try emacs -Q, C-h h to see why it is impossible to have "an API that 
returns how many lines fit on a given window".

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