Hold doesn't work as expected in 3.0.3

[John W. Eaton]

On 21-Oct-2008, Alexander Mamonov wrote:

| Bug report for Octave 3.0.3 configured for i486-pc-linux-gnu
| 
| Description:
| -----------
| 
| Consider the following piece of code:
| 
| figure(1); clf;
| hold on;
| title('ABC');
| plot([1,2],[1,2],'b-');
| plot([1,2],[2,1],'r-');
| 
| Expected behavior is that Octave would turn hold on for the figure,
| and each successive plot would not overwrite the previous one.
| This is indeed the behavior in 3.0.1 and 3.0.2. But in 3.0.3 hold
| is not turned on for some reason, and so only the last (red) line is displayed.
| 
| Changing the order of commands to
| 
| figure(1); clf;
| title('ABC');
| hold on;
| plot([1,2],[1,2],'b-');
| plot([1,2],[2,1],'r-');
| 
| fixes the problem, however it requires making changes to numerous scripts
| that used to work OK with the previous versions of Octave (and Matlab).
| 
| Repeat-By:
| ---------
| 
| figure(1); clf;
| hold on;
| title('ABC');
| plot([1,2],[1,2],'b-');
| plot([1,2],[2,1],'r-');

Please try the following patch.

Jaroslav, this changeset should be applied to the 3.0.x branch.  It is
a portion of changeset

  changeset:   8075:a028a5960e18
  user:        David Bateman <dbateman at free.fr>
  date:        Fri Aug 29 15:48:44 2008 -0400
  summary:     Fix for hold with no figures/axes. Set prop/val pairs to hggroups rather than underlying objects. Fix for equality test in array_property

but I don't think the rest of it should be applied.

Thanks,

jwe

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