[Webkit-unassigned] [Bug 247742] New: Fix broken preferred widths optimization involving subtree layout roots

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Nov 10 09:42:40 PST 2022


https://bugs.webkit.org/show_bug.cgi?id=247742

            Bug ID: 247742
           Summary: Fix broken preferred widths optimization involving
                    subtree layout roots
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ahmad.saleem792 at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Hi Team,

While going through Blink commits, I came across following commit:

Link - https://chromium.googlesource.com/chromium/blink/+/ed902d339fbff3a62e2f6124d8d40bbad45e97c0

Which removed a hacky optimization added in 2006.

We still have this optimization here:

https://github.com/WebKit/WebKit/blob/fa2a14f12031baf24d5bc6d6727c3e25c5052589/Source/WebCore/rendering/RenderBox.cpp#LL2610

The testcase attached render same as Chrome Canary 109 as in Safari Technology Preview 157 and Safari 16.1:

Test Case - https://jsfiddle.net/m4hja1pv/show

But I think it would be better tested in EWS. I will tag @Alexey (ap), who landed this in 2006. Just to get his input.

Thanks!

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