[Webkit-unassigned] [Bug 87905] New: Can avoid a second layout of flex-items in some cases

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=87905

           Summary: Can avoid a second layout of flex-items in some cases
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ojan at chromium.org
                CC: eric at webkit.org, hyatt at apple.com, tony at chromium.org,
                    jchaffraix at webkit.org
            Blocks: 62048


Whenever we're extending the logicalHeight of a flex-item that we've already laid out (e.g. due to flexing or flex-align:stretch), we only need to layout after modifying the height if the contents of the item depend on it's height (e.g. contains % height elements and is a containing block, has a background-color, etc) because we already.

The tricky bit here is maintaining the function of when we need to do a relayout.

In theory, in some of these cases we could take this a step further and avoid doing a full relayout, e.g. we don't actually need to relayout just to extend the background color further up/down; for percentage height decendants, we already keep a list of them and only need to relayout those items, etc.

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