[Webkit-unassigned] [Bug 196985] New: REGRESSION: (r244182) Layout Test editing/execCommand/insert-nested-lists.html is flaky

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196985

            Bug ID: 196985
           Summary: REGRESSION: (r244182) Layout Test
                    editing/execCommand/insert-nested-lists.html is flaky
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tsavell at apple.com
                CC: lforschler at apple.com

The following layout test is flaky on Mac Release WK2

editing/execCommand/insert-nested-lists.html

Probable cause:

This test became flakey with https://trac.webkit.org/changeset/244182/webkit

I reproduced this issue with command:
run-webkit-tests editing/execCommand/insert-nested-lists.html --iterations 500 -f

The test fails randomly on 244182 and passes fully on 244181. 

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=editing%2FexecCommand%2Finsert-nested-lists.html

Diff:
--- /Volumes/Data/slave/mojave-release-tests-wk2/build/layout-test-results/editing/execCommand/insert-nested-lists-expected.txt
+++ /Volumes/Data/slave/mojave-release-tests-wk2/build/layout-test-results/editing/execCommand/insert-nested-lists-actual.txt
@@ -43,52 +43,39 @@
 |     <br>
 |   <ol>
 |     <li>
-|       "bar"
-|     <ul>
-|       <li>
-|         <#selection-caret>
+|       <#selection-caret>

 After selecting a range and inserting another unordered list:
 | <ul>
 |   <li>
 |     "foo"
 |     <br>
-|   <ol>
+|   <ul>
 |     <li>
-|       "bar"
-|     <ul>
+|       <#selection-caret>
+|     <ol>
 |       <li>
-|         <#selection-caret>
-|       <ul>
-|         <li>

 After outdenting:
 | <ul>
 |   <li>
 |     "foo"
 |     <br>
-|   <ol>
-|     <li>
-|       "bar"
-|     <li>
-|       <#selection-caret>
-|       <br>
-|     <ul>
-|       <ul>
-|         <li>
+|   <li>
+|     <#selection-caret>
+|     <br>
+|   <ul>
+|     <ol>
+|       <li>

 After outdenting again:
 | <ul>
 |   <li>
 |     "foo"
 |     <br>
-|   <ol>
-|     <li>
-|       "bar"
-|   <li>
-|     "baz<#selection-caret>"
-|     <br>
-|   <ol>
-|     <ul>
-|       <ul>
-|         <li>
+| "baz<#selection-caret>"
+| <br>
+| <ul>
+|   <ul>
+|     <ol>
+|       <li>

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