[Webkit-unassigned] [Bug 101448] New: Move style dependencies out of style

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=101448

           Summary: Move style dependencies out of style
           Product: WebKit
           Version: 420+
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: allan.jensen at digia.com


RenderStyle currently contains a number of observed dependencies used for dynamic restyle. Many of these are recorded when children of the element are being styled and not when the element who owns the style is being styled. This complicates the code in a number of places since this changes the style after styling is considered done. It also leads to subtle bugs as seen in bug #98021, and similar bugs must be assumed to exists for accidently sharing other dynamic set flags (though those bugs only leeds to unnecessary restyles).

Since these dependencies do not belong with the style, they should instead be moved to Node or Element. To begin with I suggest moving them to RareData, if they turn out to be too common, we can try to fit some of them into the Node bitflags.

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