[Webkit-unassigned] [Bug 166883] New: [css-grid] Make the grid sizing data persistent through layouts

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=166883

            Bug ID: 166883
           Summary: [css-grid] Make the grid sizing data persistent
                    through layouts
    Classification: Unclassified
           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: jfernandez at igalia.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Until now we were clearing the grid sizing data structures after the grid's layout logic is completed. We were doing so to reduce the memory pressure, since we were not using such data after the layout. 

However, there are certain operations that may need to access such data, like baseline position of a grid container under an inline formatting context. There are other operations that can be optimized by using this data, instead of computing it again, assuming this data is still valid after the layout.

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