[macOS wk1] compositing/repaint/iframes/compositing-iframe-with-fixed-background-doc-repaint.html is flakily failing.

[Ben Schwartz]

compositing/repaint/iframes/compositing-iframe-with-fixed-background-doc-repaint.html

This test is a flaky failure on macOS wk1.

HISTORY:

https://results.webkit.org/?suite=layout-tests&test=compositing%2Frepaint%2Fiframes%2Fcompositing-iframe-with-fixed-background-doc-repaint.html&flavor=wk1&platform=mac

TEXT DIFF:

@@ -13,6 +13,8 @@
           (bounds 432.00 332.00)
           (drawsContent 1)
           (repaint rects
+            (rect 16.00 16.00 400.00 300.00)
+            (rect 16.00 16.00 400.00 300.00)
             (rect 16.00 16.00 400.00 300.00)
           )
           (children 1

DIFF URL:

https://build.webkit.org/results/Apple-Ventura-Release-AppleSilicon-WK1-Tests/279370@main%20(9650)/compositing/repaint/iframes/compositing-iframe-with-fixed-background-doc-repaint-pretty-diff.html

REPRODUCIBILITY:

I was able to reproduce this issue on macOS Sonoma (14.4, 23E214/arm64) ToT using the following command:

run-webkit-tests -1 -v --child-processes 1 compositing/repaint/iframes/compositing-iframe-with-fixed-background-doc-repaint.html --iterations 100

[Radar WebKit Bug Importer]

<rdar://problem/128884891>

[EWS]

Test gardening commit 279397@main (bdb542d7b7ad): <https://commits.webkit.org/279397@main>

Reviewed commits have been landed. Closing PR #29186 and removing active labels.