[Webkit-unassigned] [Bug 70751] New: Use the full set of rects when determining if union covers another rect.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=70751

           Summary: Use the full set of rects when determining if union
                    covers another rect.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: danakj at chromium.org


There are places where we want to know if a union of rects together cover a (rectangular) space.  Currently we just look for a single child that fills the space.  This gives no false-positives, but potentially many false negatives.

Add logic to determine if the union of rects fill a rect, and use it in these cases.

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