[vim/vim] Can there be an option to scroll a popup along with the buffer? (#4560)

[Andy Massimino]

Many plugins would like to annotate the buffer using a popup, but when the user scrolls, it is difficult to react. I would say popup_atcursor should follow the cursor when using <c-y>/<c-e>.
I think when the position goes off the screen the popup should exist but not be drawn until that position is on-screen again. Or perhaps the popup can be hidden or close optonally.

call popup_create(['foo'], {'scroll': 1})

Maybe this would be better as "buffer-positioned" popups instead of screen-positioned?

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[Bram Moolenaar]

> Many plugins would like to annotate the buffer using a popup, but when
> the user scrolls, it is difficult to react. I would say
> `popup_atcursor` should follow the cursor when using `<c-y>/<c-e>`.
> I think when the position goes off the screen the popup should exist
> but not be drawn until that position is on-screen again. Or perhaps
> the popup can be hidden or close optonally.
>

> ```vim

> call popup_create(['foo'], {'scroll': 1})
> ```
>
> Maybe this would be better as "buffer-positioned" popups instead of
> screen-positioned?

I suppose it's not just scrolling, but also inserting/deleting lines.
Thus it would be more like how a text property sticks to a certain
position. Not sure how much that is to implement...

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[Bram Moolenaar]

Closed #4560 via 12034e2.

[Ben Jackson]

Very nice! Thanks! I had a bunch of fiddly code to approximate this.