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

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Follow-up Comment #9, bug #59775 (group octave):

Quick fix: I've attached the same patch but following the 80-char limit in the
hg commit message.

Marc (with a c): Apologies, I meant to offer credit to "Mark Goldberg" for
using his test cases almost verbatim in my patch. Normally, credit isn't given
for submitting a bug report, only for copyright-able code being used (not
merely a suggestion). However, I appreciate the report very much, and I hope a
fix is still useful after so many years.

Mark (with a k): I'm glad to hear that you're working on cross-compatible
software. I will be happy to help with any classdef incompatibilities you
report, as that's my personal project of interest.

Regarding your newfound bug: it is actually because function call subsref
syntax doesn't work with classdef arrays. To be explicit about what I mean:


>> m = mre4([1, 2, 3]);
>> a = [m.A];
>> b = a/mean(a);
>> p = mre4(b);
>> p(1)
ans =

  1x1 mre4 object with properties:

      A: 0.5000

>> p(2)
ans =

  1x1 mre4 object with properties:

      A: 1

>> p(3)
ans =

  1x1 mre4 object with properties:

      A: 1.5000

>> p2 = norm(m) %ok
p2 =

  1x1 mre object with properties:

      A: [0.5000, 1, 1.5000]


It is because the built-in `subsref` method does not handle calling a function
on a classdef array. Bug #47755 is actually the same issue, though it doesn't
look like it at first glance. So we can continue the discussion there. I am
working on fixing it, although it is a bit more involved of a fix than this
patch was.

(file #58318)

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