comments too long in <PRE> affect rendering

User beware: don't make comments too long in <PRE> else wrapping even
affects browser rendering. 1 September 2005 tidy.
$ tidy -q n.html | diff n.html -
11c11,12
< Bla<!--  b l a   b l a   b l a   b l a   b l a   b l a   b l a   b l a -->Bla2
---
> Bla
> <!--  b l a   b l a   b l a   b l a   b l a   b l a   b l a   b l a -->Bla2


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