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

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Follow-up Comment #14, bug #59775 (group octave):

Hi Markus, thanks so much for the review, I don't consider it late, I'm very
grateful for whatever time you spare.

Sloppy work on my part with the OCTINTERP_API, I knew the attribute rules.
Same with the trailing whitespace, I usually do `hg export -r <rev>` or `git
show` and it shows me the whitespace, I forgot to prune it for the classdef
test files. Sorry about that.

Speaking of the classdef test files, I use MATLAB-compatible syntax because my
editor (Neovim, with several extensions) uses MATLAB syntax highlighting, and
it chokes on Octave-specific syntax like `end*` blocks. So ultimately a silly
reason, because I can pull up the classdef files in something like VS Code and
get Octave-specific syntax highlighting.

I don't have a technical argument against using Octave-specific syntax for
classdef files. So, I attached an updated version of the patch that fixes the
OCTINTERP_API/whitespace/Octave-specific classdef stuff.

(file #58442)

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Name: bug59775_v4.patch              Size: 4.5KiB
    <https://file.savannah.gnu.org/file/bug59775_v4.patch?file_id=58442>


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