[Webkit-unassigned] [Bug 21752] New: REGRESSION: referencing XHR constructor for a not yet loaded frame permanently breaks it

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=21752

           Summary: REGRESSION: referencing XHR constructor for a not yet
                    loaded frame permanently breaks it
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.5
            Status: NEW
          Keywords: HasReduction, Regression, NeedsRadar
          Severity: Normal
          Priority: P1
         Component: WebCore JavaScript
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ap at webkit.org


To reproduce, see attached test case.

This is a regression caused by r36954, which enabled certain constructors to be
cached on the Window, as they should be. Unfortunately, this conflicts with a
pre-existing issue in WebCore - the Window object is not properly
replaced/cleared when transitioning from a temporary document created before
loading to an actual one.

The attached test case checks both the pre-existing issue, and its new
manifestation.


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