[mac-wk1] Layout Test editing/selection/navigation-clears-editor-state.html is a flaky failure

[Ryan Haddad]

The following layout test is flaky on macOS WK1

editing/selection/navigation-clears-editor-state.html

Probable cause:

Unknown. This test was added in https://trac.webkit.org/changeset/232434/webkit.
It looks like it was flaky since the start, but it has become very flaky recently. The test was modified as part of https://trac.webkit.org/changeset/233236/webkit, which may be the culprit.

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=editing%2Fselection%2Fnavigation-clears-editor-state.html

--- /Volumes/Data/slave/highsierra-release-tests-wk1/build/layout-test-results/editing/selection/navigation-clears-editor-state-expected.txt
+++ /Volumes/Data/slave/highsierra-release-tests-wk1/build/layout-test-results/editing/selection/navigation-clears-editor-state-actual.txt
@@ -3,7 +3,7 @@
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-PASS freed more than 60 documents
+FAIL freed fewer than 60 documents
 PASS successfullyParsed is true
 
 TEST COMPLETE

[Ryosuke Niwa]

Ugh... conservative GC is hard :(

[Saam Barati]

We can just make the threshold smaller.

[Saam Barati]

Created attachment 344366 [details]
patch

[Mark Lam]

Comment on attachment 344366 [details]
patch

r=me

[Saam Barati]

Created attachment 344367 [details]
patch for landing

[WebKit Commit Bot]

Comment on attachment 344367 [details]
patch for landing

Clearing flags on attachment: 344367

Committed r233555: <https://trac.webkit.org/changeset/233555>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.

[Radar WebKit Bug Importer]

<rdar://problem/41873906>