> Do all displayed XUL documents always go through DoneWalking?
Yes.
> It's also not super future proof
It's a temporary "safe for 1.9 at this point" measure until we fix the XUL notification breakage...
> Do all displayed XUL documents always go through DoneWalking?
Yes.
> It's also not super future proof
It's a temporary "safe for 1.9 at this point" measure until we fix the XUL notification breakage...