[bug #59775] "error: mark_as_constructed: invalid object" when constructor returns classdef array

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Follow-up Comment #8, bug #59775 (group octave):

Here is yet another classdef array issue. I have not located an existing bug
report for this, so I'm happy to open a new one unless advised otherwise.

As the following shows, operating on a classdef object array is okay outside
of the class. However, when performing the same operation in a class method an
indexing error is issued.

classdef mre4
    properties
        A
    end
    methods
        function obj = mre4(a)
            if nargin > 0
                if isscalar(a)
                    obj.A = a;
                else
                    obj(size(a)) = mre4();
                    c = num2cell(a);
                    [obj.A] = c{:};
                end
            end
        end
        function obj = norm(objin)
            a = [objin.A];
            b = a / mean(a);
            obj = mre(b);
        end
    end
end


octave:101> m = mre4([1,2,3]);
octave:102> a = [m.A]; %ok
octave:103> b = a/mean(a); % ok
octave:104> p = mre4(b); % ok
octave:105> p(1)
ans =
  1x1 mre4 object with properties:
      A: 0.5000
octave:106> p(2)
ans =
  1x1 mre4 object with properties:
      A: 1
octave:107> p(3)
ans =
  1x1 mre4 object with properties:
      A: 1.5000
octave:108> p2 = m.norm(); %not ok
error: can't perform indexing operation on array of mre4 objects
octave:109> 




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