editing/selection/move-by-character-brute-force.html is a flaky timeout on BigSur wk 2 Release on Apple Silicon Macs only. HISTORY: https://results.webkit.org/?suite=layout-tests&test=editing%2Fselection%2Fmove-by-character-brute-force.html No timeout diff or stderr was generated in the layout test results.
Upon further inspection it appears this also has been timing out on Debug as well. It was constantly timing out, but then it stopped and became just a flaky failure starting at r276578. Since this only appears to occur on Apple Silicon Macs, I cannot reproduce the timeout as I do not have access to said system type. Updated test expectations to Pass Timeout here: https://trac.webkit.org/changeset/277340/webkit
<rdar://problem/77864182>
This test is very slow on Intel too, so it probably needs a [ Slow ] attribute. It's surprising that it's slower on Apple Silicon though, should be a configuration issue like bug 225666.
As per @Alexey's recommendation, I have updated the test expectations to [ Slow ] instead of [ Pass Timeout ] here: https://trac.webkit.org/changeset/277398/webkit