Limit live hints to visible carets

[eugenesvk]

I've noticed that with live hints moving a lot of carets (multicursor) adds visible lag. Is there a way to somehow limit whatever work is performed by ColorHints to only visible carets so that even if you have a 1000 carets, but on the current screen only see 3, then you'll have no lag?

[braver]

We could simply limit the number of hints we try to render in https://github.com/braver/ColorHints/blob/master/ColorHints.py#L52. I mean, what would you need a thousand for? Having hundreds of phantoms is likely to slow down rendering performance anyway. I'm thinking, if the selection contains more than X cursors we stop drawing hints automatically (manually running the command could still work).

Perhaps another possibility is to only render hints for selections (cursor positions) that are visible (that intersect visible_region) ... but that would need updating on-scroll, which adds render costs (which we're trying to prevent here).

[eugenesvk]

It wasn't a literal 1000, maybe a few hundreds, don't remember exactly, I need it to do some formatting, which is easier to do visually than vs a bunch of replacement operations.

but that would need updating on-scroll, which

Could it maybe not do the scrolling updates? So at least for the initial screen the live hints would be correct, which is better than other alternatives, but if you scroll, then it'll stop updating the newly visible ones until you get back to a reasonable # of selections? Though that may be overly complicated, for my case either of your suggestions would work as I don't expect to need hints when doing such many-cursor operations