1951037 - Redesign `WhiteSpaceVisibilityKeeper` as stack only classes and nested classes of `HTMLEditor`

Status: NEW

(Core :: DOM: Editor, task)

Description

[Masayuki Nakano [:masayuki] (he/him)(JST, +0900)(sickish, maybe slower respose)]

Currently, WhiteSpaceVisibilityKeeper is a class having only static methods. Currently the new white-space normalizer (and the patched which will be landed in bug 1940377) is partially written in WhiteSpaceVisibilityKeepr, but the others are written in HTMLEditor itself. Additionally, there is no concrete reason of managing them in 2 places. Additionally, the methods have a lot of similar lambdas for the performance to skip checking the white-space style.

I'm currently thinking that after deleting the legacy white-space normalizer, we should make a base nested class of HTMLEditor which stores basic information of the target Text and each subclass should implement each final output of WhiteSpaceVisibilityKeeper does.