[Webkit-unassigned] [Bug 149764] New: [CSS Grid Layout] Don't need to reset auto-margins during grid items layout

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=149764

            Bug ID: 149764
           Summary: [CSS Grid Layout] Don't need to reset auto-margins
                    during grid items layout
    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

When dealing with auto-margins alignment we were reseting auto values for margins, when grid items don't need to be laid out, just before using them to set the grid items location. 

This operation can be avoided if we just compute them, when required, during the execution of the stretching logic. 

This change could help us to avoid performing extra layout calls on some grid items.

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