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Use alternative approach to shadow-selection-polyfill
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Since the selection shadow DOM is not implemented in Safari, a fix was
introduced in January 2021[1] to use the shadow-selection-polyfill
library to provide that functionality and allow selecting text to
comment.

As of March 2021 however, an fix to Safari[2] makes the
shadow-selection-polyfill not working from Safari v14.1 onwards.

It is not clear whether the library will ever work again in Safari, so
much so that a warning, explaining this, as been added to the
shadow-selection-polyfill README.md.

An alternative approach however has been suggested. The main idea is:
* Listen to 'selectionchange' events of 'contenteditable' areas.
* Trigger a 'beforeinput' event by running and immediately terminating
  an `execCommand`.
* use the getTargetRanges() method to get a list of static ranges

This change is the porting of that idea (as explained here[4]).

[1] https://gerrit-review.googlesource.com/c/gerrit/+/293242
[2] https://trac.webkit.org/changeset?reponame=webkit&new=269662
[3] https://github.com/GoogleChromeLabs/shadow-selection-polyfill
[4] GoogleChromeLabs/shadow-selection-polyfill#11

Bug: Issue 13955
Change-Id: I4daebbfd571dc3f11c2897a2282d6b6b3619a2c0
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syntonyze committed May 25, 2021
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Expand Up @@ -1056,216 +1056,3 @@ THE SOFTWARE.

----


[[shadow-selection-polyfill]]
shadow-selection-polyfill

* shadow-selection-polyfill

[[shadow-selection-polyfill_license]]
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