[changeset] problems with cla()

[John W. Eaton]

On 22-Oct-2008, Ben Abbott wrote:

| I noticed that clearing an axes twice ...
| 
| octave:73> clear all
| octave:74> plot(1:10)
| octave:75> cla
| octave:76> cla
| error: invalid vector index = 1
| error: called from:
| error:   /Users/bpabbott/Development/mercurial/octave-3.1.51/scripts/plot/findobj.m at line 75, column 5
| error:   /Users/bpabbott/Development/mercurial/octave-3.1.51/scripts/plot/cla.m at line 74, column 8
| 
| Changeset is attached.

I applied it.

Should we be looking at all children, or just those that don't have 
the handlevisibility property set to "off"?

jwe