Dotted leader in index entries

[Duncan Hothersall <dh@capdm.com>]

[Now with a proper example!]

Hello all.

I'm using Mk II. I need to set up dotted leaders between an index entry 
and its page number as show in this runnable sample:

\def\Icmd#1{#1\dotfill}
\setupregister[index][n=2,textcommand=\Icmd,distance=1em,alternative=A]
\starttext
\index{Example+This index entry doesn't quite work}\index{This is 
okay}\index{Example+This is okay}\index{This index entry is not correct 
at all}\index{Example+This is another example in which the leaders don't 
work cos of wrapping}A little text.\par
\placeindex
\stoptext

When the entry text is just long enough to fill up the horizontal space 
it is pushing the number over onto the next line. What I really need is 
for all page numbers to be at the right hand side, with leading dots. So 
I'd like a solution to produce either this:

Long index entry text
   ....................123

or this:

Long index entry
   text..............123

At the moment I'm putting forced line breaks before the last word to 
achieve what I need, but I would really like to automate this!

Thanks for any help, hope the issue is clear.

Duncan

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