[Webkit-unassigned] [Bug 240841] New: REGRESSION (r294610): [ macOS wk1 ] Two fast/forms/ tests are a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=240841

            Bug ID: 240841
           Summary: REGRESSION (r294610): [ macOS wk1 ] Two fast/forms/
                    tests are a flaky failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rackler at apple.com

Description:
fast/forms/scroll-into-view-and-show-validation-message.html
fast/forms/textarea-scrolled-endline-caret.html

The first failure I saw on the dashboard was on 5/19/2022 at r294525.  r294523 modified updateLayout() via HTMLTextAreaElement::childrenChanged, caused the tests to fail and others and reverted at r294550. The tests begin passing consistently again until r294610 and then begin flaky failing.  

REPRODUCTION STEPS
I can reproduce this on r294610, but unable to reproduce it on r294609 or earlier.

Command: 
run-webkit-tests --debug -1 --root 294610-debug --exit-after-n-failures 1 --exit-after-n-crashes-or-timeouts 1 --iterations 250 -f --no-retry fast/forms/scroll-into-view-and-show-validation-message.html

Result: 
Unexpected flakiness: text-only failures (1)
  fast/forms/scroll-into-view-and-show-validation-message.html [ Pass Failure ]

History:
https://results.webkit.org/?suite=layout-tests&suite=layout-tests&test=fast%2Fforms%2Fstate-restore-to-non-edited-controls.html&test=fast%2Fforms%2Ftextarea-scrolled-endline-caret.html&platform=mac&flavor=wk1&limit=50000

Diff:
1. fast/forms/scroll-into-view-and-show-validation-message.html
--- /Volumes/Data/worker/Apple-Monterey-Debug-AppleSilicon-WK1-Tests/build/layout-test-results/fast/forms/scroll-into-view-and-show-validation-message-expected.txt
+++ /Volumes/Data/worker/Apple-Monterey-Debug-AppleSilicon-WK1-Tests/build/layout-test-results/fast/forms/scroll-into-view-and-show-validation-message-actual.txt
@@ -3,8 +3,10 @@
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


-PASS message is "Fill out this field"
+FAIL Unexpected message:
+FAIL message should be Fill out this field. Was .
 PASS successfullyParsed is true
+Some tests failed.

 TEST COMPLETE
 Submit

2. fast/forms/textarea-scrolled-endline-caret.html

--- /Volumes/Data/worker/Apple-Monterey-Debug-WK1-Tests/build/layout-test-results/fast/forms/textarea-scrolled-endline-caret-expected.txt
+++ /Volumes/Data/worker/Apple-Monterey-Debug-WK1-Tests/build/layout-test-results/fast/forms/textarea-scrolled-endline-caret-actual.txt
@@ -1,2 +1,2 @@

-Test Succeeded
+Test Failed: caret is at 1

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