[Webkit-unassigned] [Bug 97706] New: Scroll offset of flex items lost during relayout

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=97706

           Summary: Scroll offset of flex items lost during relayout
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: http://jsfiddle.net/XrU6J/4/
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: tony at chromium.org
                CC: ojan at chromium.org
            Blocks: 62048


See the test case in the URL.  It does the following:
1) A flexbox with a flexitem that has a scrollbar.
2) Set the scroll offset of the flexitem.
3) Change the flexbox (e.g., resize the window or insert a new flex item).
4) The scroll offset is lost.

This is happening because flexbox does a 2 pass layout of the flex children. We layout the child without scrollbars (to get the size used for flexing), then we layout the child at it's final size.  During the first layout, we remove the scrollbars, then during the second layout, we recreate the scrollbars (but without the scroll offset).

There's some code in the old flexbox to handle this, we just need to add it to the new flexbox.

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