Question on nsWebBrowser and nsIDocShellTreeItem

[Boris Zbarsky]

I just noticed that nsIWebBrowser implements nsIDocShellTreeItem.  Does anyone 
know why?  More to the point, does anyone know whether its mParent is ever set, 
and if so, where?

The reason I ask is that having a SetParent on nsIDocShellTreeItem is rather 
broken-by-design (it allows creatiion of a malformed docshell tree).  As a 
result, I'd like to make the parent attribute readonly (and have parents be set 
either at creation time or through calling AddChild/RemoveChild).

-Boris
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