files: fix virtual list will-change value (60fps superpowers)

[pulsejet]

Follow up of #40958

I got the will-change wrong previously; it's the table that's scrolling, not the tbody. The performance with this patch is absolutely insane (we might want to increase the buffer a bit from 3 though). It's so good, actually, that I'm considering making this scroller into a standalone library (unless there's already a plan for that).

Here's how the updates during scrolling look like:

Before	After

[pulsejet]

Note: I noticed this is somewhat browser dependent. Firefox seems to already have been detecting and applying this optimization. So the main difference here is for Chromium (and maybe WebKit)

[susnux]

Nice! 🚀

But please fix the missing signoff 😉

[pulsejet]

But please fix the missing signoff 😉

Argh not again 😩 .. done!

we might want to increase the buffer a bit from 3 though

need opinion on this btw, if anyone can test scrolling fast in a large directory. I think 5 or 6 might be good (EDIT: or maybe it's not that important ... can't see a lot of difference)

[skjnldsv]

need opinion on this btw, if anyone can test scrolling fast in a large directory. I think 5 or 6 might be good (EDIT: or maybe it's not that important ... can't see a lot of difference)

All my tests and development over the last months have been done on a 1k images folder :)

[skjnldsv]

/compile amend /

[skjnldsv]

@pulsejet your commit names doesn't follow conventional commits
files: fix virtual list will-change value should be fix(files): virtual list will-change value (adjusted)