[Octave-bug-tracker] [bug #49734] uimenu's position is sometimes 0

[Pantxo Diribarne]

Follow-up Comment #7, bug #49734 (project octave):

@Markus: I don't think following Matlab here is a good idea, if 0 is an
incorrect value what is the point of displaying a warning when we trigger an
error for other incorrect values?
More important I think is having the upper value right: this means that we
need to define a custom uimenu::set_position which checks the number N of
uimenus in the parent object and error out if the requested value is greater
than N.

The position property is updated by the graphics_toolkit but setting it in
uimenu.m is probably the best solution. Something like 


if (! any (strcmp (varargin, "position")))
  nmenu = numel (allchild (h, "-depth", 1, "type", "uimenu"))
  varargin{end+1} = "position";
  varargin{end+1} = nmenu+1;



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