Completion bug in gud or comint

[Lluís <xscript@gmx.net>]

I didn't find any related bug report, but I'm not sure if this has been reported
before in this list.

Steps to reproduce it:

  M-x gdb
  gdb -i=mi<RET>
  >> (gdb) _
  s<TAB>
  >> (gdb) s_
  >> <completion buffer output>
  o<TAB>
  >> source_
  <TAB>
  >> (gdb) _source

As you can see, the comint prompt ('(gdb)') "disappears" (already strange
enough) and the point moves accordingly when there is a common completion prefix
available, but performing a new completion makes the prompt "reappear".

The most annoying thing is that while the last completion restored the prompt,
point is kept in its position before the prompt restoration, which means not
having point at the end of the line.

I'm using emacs-snapshot 1:20111206-1+squeeze, but I also tried to evaluate
'comint.el' and 'gud.el' from the latest trunk before the test.


Thanks,
  Lluis

-- 
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 something new, the whole world becomes that much richer."
 -- The Princess of Pure Reason, as told by Norton Juster in The Phantom
 Tollbooth