[Webkit-unassigned] [Bug 109718] New: [CSS Grid Layout] Refactor grid position resolution code to support an internal grid representation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=109718

           Summary: [CSS Grid Layout] Refactor grid position resolution
                    code to support an internal grid representation
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jchaffraix at webkit.org
                CC: tony at chromium.org, xan.lopez at gmail.com,
                    ojan at chromium.org
            Blocks: 109714


Currently we always re-resolve the grid computed position when we iterate over all our children. 

As computing the 2D grid will be expensive, we would rather reuse the grid items' position information from the grid instead of recomputing it every time as we do (this will be even more true when we add support for grid-auto-flow as this is not an answer that can be inferred from the style anymore).

We have 2 variants of resolveGridPosition that do the same thing but could be updated to return different results based on whether we use our cached grid or not.

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