[Webkit-unassigned] [Bug 139058] New: [CSS Grid Layout] Wrong arguments passed to computeNormalizedFractionBreadth

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=139058

            Bug ID: 139058
           Summary: [CSS Grid Layout] Wrong arguments passed to
                    computeNormalizedFractionBreadth
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: svillar at igalia.com

RenderGrid::computeNormalizedFractionBreadth() is supposed to get as fourth argument either the grid element's content box size or the max-size of a particular grid item. For the former we were incorrectly passing the free space after distributing the available space to tracks.

Apart from that, that method has a bug in its implementation. As we were using the free space instead of the grid element's content box size, we didn't have to subtract the usedBreadth of grid tracks from the passed in value. That does not work for the case of the caller passing the max-size of a particular item.

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