DummyParserRequest and XML

I got incremental XML loading (bug 18333) going. However, the comments 
in the HTML content sink said that a DummyParserRequest is needed in 
order to keep end events firing on interrupting the parser, so I hoisted 
DummyParserRequest to nsContentSink.cpp and used it on the XML side as 
well. This broke the incremental loading. I thought I had neglected to 
prepare the wall clock timing stuff properly before letting expat parse 
a buffer. I fixed that but incrementality remained broken.

I took the DummyParserRequest out. Incrementality worked again.

It turns out that DummyParserRequest is on its way out anyway:
https://bugzilla.mozilla.org/show_bug.cgi?id=294115

Is the fix for 
https://bugzilla.mozilla.org/show_bug.cgi?id=293818
already taking care of everything on the XML side that 
DummyParserRequest takes care of on the HTML side?

Which events are at stake? OnLoad? Others? How should I proceed 
investigating whether I break something?

-- 
Henri Sivonen
[email protected]
http://hsivonen.iki.fi/