[Webkit-unassigned] [Bug 97937] New: Losing scroll position when using horizontal-bt or vertical-rl layout

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=97937

           Summary: Losing scroll position when using horizontal-bt or
                    vertical-rl layout
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kenneth at webkit.org
                CC: tony at chromium.org, ojan at chromium.org


This is related to bug 97706. Basically we cannot postpone applying scroll changes for RenderBlocks with opposite writing mode.

A BT or RL layer needs to have its overflow, overflow in the opposite than the normal direction and it should thus be moved (scroll position change) to account for this. The flex box code does a 2-pass layout, one layout "without scrollbars" to find the actual size, and then one at the final size.

Postponing this initial "position correction" and applying it later as a scroll offset breaks layouts, as it is not really a scroll position offset.

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