[Webkit-unassigned] [Bug 255434] New: [margin-trim] RenderBox should not be performing trimming

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=255434

            Bug ID: 255434
           Summary: [margin-trim] RenderBox should not be performing
                    trimming
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sgill26 at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

RenderBox performs some trimming inside of constrainBlockMarginInAvailableSpaceOrTrim and computeOrTrimInlineMargin as the renderer goes through layout. This has some unfortunate side effects, such as requiring us to set the rare data bits to indicate the margin has been trimmed at the same location. This action requires a const_cast that could be avoided since trimming should not occur at the RenderBox level and should be occurring completely in the layout system it is in (flex, grid, or block). We should make sure that the trimming logic is contained wholly within each layout system and should remove this logic from RenderBox once it is

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