[Webkit-unassigned] [Bug 259528] New: REGRESSION(266045 at main?): [ Monterey+ ] fast/attachment/mac/wide-attachment-image-controls-basic.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=259528

            Bug ID: 259528
           Summary: REGRESSION(266045 at main?): [ Monterey+ ]
                    fast/attachment/mac/wide-attachment-image-controls-bas
                    ic.html is 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: ben_schwartz at apple.com
                CC: webkit-bot-watchers-bugzilla at group.apple.com,
                    webkit-bug-importer at group.apple.com, youennf at gmail.com

fast/attachment/mac/wide-attachment-image-controls-basic.html

This test is a flaky failure on macOS Monterey and above.

HISTORY:

https://results.webkit.org/?suite=layout-tests&test=fast%2Fattachment%2Fmac%2Fwide-attachment-image-controls-basic.html

TEXT DIFF:

     RenderBody {BODY} at (8,8) size 784x82
       RenderAttachment {ATTACHMENT} at (1,1) size 266x80
         RenderFlexibleBox {DIV} at (0,0) size 266x80 [bgcolor=#0000000D]
-          RenderGrid {DIV} at (14,14) size 0x52
-            RenderImage {IMG} at (0,26) size 0x0
-          RenderFlexibleBox {DIV} at (32,0) size 210x80
-            RenderGrid {DIV} at (0,40) size 210x0
-      RenderText {#text} at (268,26) size 4x18
-        text run at (268,26) width 4: " "
-      RenderImage {IMG} at (272,20) size 20x20
+          RenderGrid {DIV} at (14,14) size 52x52
+            RenderImage {IMG} at (0,0) size 52x52
+          RenderFlexibleBox {DIV} at (84,0) size 158x80
+            RenderGrid {DIV} at (0,40) size 158x0
+      RenderText {#text} at (268,52) size 4x18
+        text run at (268,52) width 4: " "
+      RenderImage {IMG} at (272,46) size 20x20
       RenderText {#text} at (0,0) size 0x0
 layer at (9,9) size 266x80
   RenderBlock (relative positioned) {DIV} at (0,0) size 266x80 [color=#00000000]

DIFF URL:

https://build.webkit.org/results/Apple-Ventura-Release-AppleSilicon-WK2-Tests/266314@main%20(4170)/fast/attachment/mac/wide-attachment-image-controls-basic-pretty-diff.html

REPRODUCIBILITY:

I was able to reproduce this bug on macOS Ventura Release ToT running the test as follows:

run-webkit-tests --iterations 500 --verbose fast/attachment/mac/wide-attachment-image-controls-basic.html

REGRESSION:

I was able to bisect a regression point via local testing and the flakiness dashboard. This test reproduced at 266045 at main, but it did not reproduce at 266044 at main. Changes at 266045 at main appear to be related to this error, but more investigation is needed to determine for sure.

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