Bug in command line completion

[John W. Eaton]

On 11-May-2009, Rik wrote:

| The Mercurial tip for Octave shows an odd behavior for undefined
| variables or functions.  Specifically, after attempting to use an
| undefined variable it is added to the command line completion list even
| though it does not exist.  This behavior is not present in the 3.0.0
| stable release.
| 
| To reproduce:
| 1) type 'fo<TAB><TAB>' to show functions and variables starting with 'fo'.
| Octave responds with:
| fopen    for      fork     format   formula
| 
| 2) type 'foobar<ENTER>'
| Octave responds with:
| error: `foobar' undefined near line 1 column 1
| 
| 3) type 'fo<TAB><TAB>'
| Octave responds with:
| foobar   fopen    for      fork     format   formula
| 
| 'foobar' does not appear to be in any other symbol table as the
| functions 'who' and 'which' know nothing about foobar.

I checked in the following change for this problem.

  http://hg.savannah.gnu.org/hgweb/octave/rev/9c2349a51218

I think this change is also a more complete fix for the problem
with undefined symbols appearing in the output from who that Jaroslav
fixed with 9250:80c299c84796.

This change should probably be applied for 3.2.0.

Thanks,

jwe