[Octave-bug-tracker] [bug #57391] graphics callback error after two consecutive calls to "stem"

[Rik]

Update of bug #57391 (project octave):

                  Status:               Confirmed => Ready For Test         

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Follow-up Comment #2:

The problem is that when deleting the hggroup (which is called when newplot
deletes all children of the current axes) the "xlim" property changes from [0,
10] to [0, 1].  I don't know why this needs to happen.  It may be that the
axes are set to auto-update as data is added or removed and removing the
hggroup removes all data so that the limits go back to their default of [0,
1].  In any case, the change in xlim causes the listener on that axes property
to fire and call the stem function update_xlim.  I was able to suppress the
error by checking whether the hggroup was in the process of being deleted. 
See the code below.


function update_xlim (h, ~)

  kids = get (h, "children");
  xlim = get (h, "xlim");

  for i = 1 : length (kids)
    obj = get (kids(i));
    if (strcmp (obj.type, "hggroup") && isfield (obj, "baseline")
->      && ! strcmp (obj.beingdeleted, "on"))
      if (any (get (obj.baseline, "xdata") != xlim))
        set (obj.baseline, "xdata", xlim);
      endif
    endif
  endfor


I checked in this patch here:
https://hg.savannah.gnu.org/hgweb/octave/rev/f78dc0d6ad2d.

Marking as Ready for Test.


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