3.6.0 regression: non-deterministic filter selection ...

[Tor Lillqvist]

>         Tor - I had a feeling you were looking at some (MathML ?) detection
> issue that may be related to this (and/or fixed it already);

Don't think so; the problem I looked at was caused by the MathML
filter "detecting" *any* XML file as MathML, but then obviously
failing to actually load it (and after a load attempt has failed there
is no loop back to try other filters). In this case the user *wanted*
the ASCII filter to be the one invoked. (Surely there must be better
arbitrary-XML editors than Writer, that at least make sure XML start
and end tags match etc automatically, but oh well).

--tml