add fastdom to batch reads and writes to the DOM

[halvtomat]

Add fastdom to increase customMarker performance by batching DOM reads and writes.

Original PR #163
Closes #162

[socket-security]

New dependencies detected. Learn more about Socket for GitHub ↗︎

Packages	Version	New capabilities	Transitives	Size	Publisher
fastdom	1.0.11	None	+1	71.3 kB	wilsonpage

[halvtomat]

I noticed that a new bug is introduced by this change, all markers flicker once on the dragEnd event. Have tried to find the cause of this without luck. IMO the performance is worth the small annoyance that the flicker causes but it would be best to find and remove the bug as well.

[HusamElbashir]

I noticed that a new bug is introduced by this change, all markers flicker once on the dragEnd event. Have tried to find the cause of this without luck. IMO the performance is worth the small annoyance that the flicker causes but it would be best to find and remove the bug as well.

It's obviously less than ideal but if you can't fix the flicker can you at least share a reproduction so we can have that documented? You can fork this sandbox and point it at your fork/branch:
https://codesandbox.io/p/sandbox/confident-haze-xq7wgh?file=package.json
Note that you'll need the latest from develop. @Tofandel added a prepare script so you could install directly from git.

[halvtomat]

Here is a reproduction of the flicker. https://codesandbox.io/p/sandbox/hardcore-pike-9dcgzn
It only happens on the dragEnd event.

[HusamElbashir]

OK this is more noticeable than I had hoped. I'll accept the PR for now but it will have to wait for a fix before we can release it. Might have to put it behind a enableBatchMode feature flag or similar if it takes too long to fix.

[HusamElbashir]

Thanks for the contribution @halvtomat!