[Webkit-unassigned] [Bug 129372] New: [CSS Grid Layout] Fix positioning grid items using named grid lines/areas

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=129372

           Summary: [CSS Grid Layout] Fix positioning grid items using
                    named grid lines/areas
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: svillar at igalia.com


Currently our code assumes that a <custom-ident> in -webkit-grid-{column|row}-{start|end} and -webkit-grid-{column|row} is always a grid area. That's wrong because the <custom-ident> could be also a explicitly named grid line.

Our resolution code is not correct either. The specs mandates us to:
    * first we try to match any existing grid area.
    * if there is a named grid line with the name <custom-ident>-{start|end} for -webkit-grid-{column|row}-{start|end} defined before the grid area then we use it instead of the grid area.
    * otherwise if there is a named grid line we resolve to the first such line.
    * otherwise we treat it as 'auto'.

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