[Webkit-unassigned] [Bug 91766] didFirstVisuallyNonEmptyLayout() callback not fired for initial about:blank page in new loading window

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=91766





--- Comment #12 from Charles Reis <creis at chromium.org>  2012-07-19 21:14:37 PST ---
(In reply to comment #9)
> > We don't show the pending URL if there's a committed URL in the window, so there's no risk.  That's also a much less common case, so it's ok leaving it that way.
> 
> So, you only care about the initial document?  Blankness isn't really the thing you're after here.  You just want to hide the fact that WebCore uses an initial about:blank document in newly created windows.

Yes, I only care about the initial document.  But I think I do care whether it's still blank or not.  The spec allows the window's opener to modify the initial document (whether a load is in progress or not), and it's not safe to show the loading URL if the initial document has been modified.  The attached repro page demonstrates this.

I would like to show the loading URL until the initial document has been modified, but I haven't yet found a way to detect the modification.

(In reply to comment #11)
> Have you looked at dispatchDidNewFirstVisuallyNonEmptyLayout to see whether that works better for your use case?

Just took a look.  Good thought, but it isn't called when I modify the content of the initial document.  Other things I could check?

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