Created attachment 440371 [details] Screenshot Selecting text in https://ews-build.s3-us-west-2.amazonaws.com/Windows-EWS/r440327-109446/js/dom/toInt32UInt32-crash-log.txt causes double selection painting at the end of each line. See screenshot.
This doesn't reproduce with Safari 15.1 beta, so looks like a recent regression indeed.
<rdar://problem/83939949>
Created attachment 440488 [details] Patch
Committed r283709 (242635@main): <https://commits.webkit.org/242635@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 440488 [details].