REGRESSION: [ macOS wk1 ] css3/selectors3/xml/css3-modsel-d2.xml is flaky failing

[Jacob Uphoff]

css3/selectors3/xml/css3-modsel-d2.xml

This test has been flaky failing and I believe first seen on commit r252886 however with the flakiness of the test, I do not believe it started there.

I ran the test in iterations x5000 and did not reproduce the failure

History:

https://results.webkit.org/?suite=layout-tests&test=css3%2Fselectors3%2Fxml%2Fcss3-modsel-d2.xml&limit=50000&platform=ios&platform=mac

Diff:

--- /Volumes/Data/slave/catalina-release-tests-wk1/build/layout-test-results/css3/selectors3/xml/css3-modsel-d2-expected.txt
+++ /Volumes/Data/slave/catalina-release-tests-wk1/build/layout-test-results/css3/selectors3/xml/css3-modsel-d2-actual.txt
@@ -10,5 +10,6 @@
       RenderBlock {div} at (0,34) size 800x0
       RenderBlock {div} at (0,34) size 800x32
         RenderBlock {div} at (0,0) size 800x32
+          RenderBlock {div} at (0,0) size 800x0
           RenderBlock {div} at (0,0) size 800x32
-            RenderBlock {div} at (0,0) size 800x32 [bgcolor=#FF0000]
+            RenderBlock {div} at (0,0) size 800x32 [bgcolor=#00FF00]

[Jacob Uphoff]

Created attachment 389538 [details]
Update Test Expectations

[Truitt Savell]

Comment on attachment 389538 [details]
Update Test Expectations

Clearing flags on attachment: 389538

Committed r255575: <https://trac.webkit.org/changeset/255575>

[Radar WebKit Bug Importer]

<rdar://problem/59116825>