[Webkit-unassigned] [Bug 11419] New: REGRESSION (r17299): Assertion failure in -[WebHTMLView(WebPrivate) _topHTMLView] ([view isKindOfClass:[WebHTMLView class]]) when running the layout tests

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=11419

           Summary: REGRESSION (r17299): Assertion failure in -
                    [WebHTMLView(WebPrivate) _topHTMLView] ([view
                    isKindOfClass:[WebHTMLView class]]) when running the
                    layout tests
           Product: WebKit
           Version: 420+ (nightly)
          Platform: Macintosh
        OS/Version: Mac OS X 10.4
            Status: NEW
          Keywords: Regression
          Severity: Normal
          Priority: P1
         Component: Tools / Tests
        AssignedTo: webkit-unassigned at opendarwin.org
        ReportedBy: mitz at webkit.org
                CC: bdash at webkit.org


run-webkit-tests editing/selection/fake-drag.html
editing/selection/paragraph-granularity.htmlresults is the above assertion
failure.

Backtrace:
0   com.apple.WebKit            0x0105ab14 -[WebHTMLView(WebPrivate)
_topHTMLView] + 320 (WebHTMLView.m:946)
1   com.apple.WebKit            0x0105ab70 -[WebHTMLView(WebPrivate)
_isTopHTMLView] + 60 (WebHTMLView.m:952)
2   com.apple.WebKit            0x01074324
-[WebHTMLView(WebDocumentInternalProtocols) draggingCancelledWithDraggingInfo:]
+ 64 (WebHTMLView.m:5952)
3   com.apple.WebKit            0x0109cf74 -[WebView
_delegateDragOperationForDraggingInfo:] + 216 (WebView.mm:2338)
4   com.apple.WebKit            0x0109d2f8 -[WebView draggingUpdated:] + 68
(WebView.mm:2379)
5   DumpRenderTree              0x00005d60 -[EventSendingController
mouseMoveToX:Y:] + 1160 (EventSendingController.m:221)

The problem is that EventSendingController calls WebView's draggingUpdated,
passing nil. Down in _delegateDragOperationForDraggingInfo:, windowPoint is
assigned garbage and newDraggingView gets assigned randomly (with either 0 or
the WebView). As fras as I can tell, the regression is just the result of
"different garbage" (I observed that windowPoint is different).

I think DumpRenderTree is at fault, as EventSendingController shouldn't call
draggingUpdated if draggingInfo is 0 (nor draggedImage:movedTo:). Maybe
WebView's behavior in this case can improve, by asserting and returning
immediately from draggingUpdated if passed nil.


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