bug#47712: 27.1; Provide `string-display-width` function, which takes properties into account, `substring-width`

[Lars Ingebrigtsen]

Daniel Mendler <mail@daniel-mendler.de> writes:

> Note that I would like to have an implementation of
> `substring-width`/`string-display-width`/`substring-display-width`
> which does not allocate, since this reduces the GC pressure when
> formatting many items. How do you think about this?
>
> Regarding images, different fonts, maybe a
> `string-property-pixel-width` would be useful too. But for the use
> cases I have in mind (formatting monospaced text) computing columns is
> sufficient.

Sure; I think a non-allocating function to count monospaced string width
would be useful.

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