[dev-context] \dodoregister bug

[Duncan Hothersall]

With latest ConTeXt:

--
\starttext
This is a paragraph of text with an index term at the very end of it.
This is a paragraph of text with an index term at the very end of it.
\index{test}

This is another paragraph. This is another paragraph. This is another
paragraph.
\stoptext
--

These two paras run together. If I remove the recent fix (which I
requested - sorry Hans!) to \dodoregister in core-reg:

\def\dodoregister[#1]#2#3%
  {\doprocesspageregister[#1]{#2}{#3}}

% intead of

%% \def\dodoregister[#1]#2#3%
%%  {\doflushatpar{\doprocesspageregister[#1]{#2}{#3}}}

This makes things work correctly again, but of course it also removes
the nice fix which stopped \index calls at the start of paras causing
additional white-space.

I suggest that this is reverted though, because this is probably a more
serious and common problem than the one we were trying to fix.

Duncan