[Octave-bug-tracker] [bug #39813] rectangle(..., 'Parent', hg) not working for group objects

[Pantxo Diribarne]

Follow-up Comment #7, bug #39813 (project octave):

For your test: only "ishandle (li0)" returns false.

The rule I could draw is:
 - if hgsave is an axes: children are deleted, brothers preserved
 - else: all the ancestor axes' children are deleted except the oldest
(gran)parent of hgsave with all its descendance (including hgsave's
(gran)uncles and brothers).

See the result of the following test


hf = figure (1234), clf;
li = [];
hg = [];
hax = axes (); hold on;
levels = 6;

for ii = 1:levels
  if ii == 1
    hg(ii) = hggroup ();
    li(ii) = line (1:10, 1:10);
  else
    hg(ii) = hggroup ('parent', hg(ii-1));
    li(ii) = line (1:10, 1:10, 'parent', hg(ii-1));
  end
end

uncles = li(1:end-1);
brother = hg(end);
hold off;
newplot (li(end))
ishandle(uncles)
ishandle(brother)

### result

ans =

     0     1     1     1     1


ans =

     1
 

This is also what we currently obtain in octave with the most recent
changesets you pushed.


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