[Octave-bug-tracker] [bug #49421] Can't set properties in a subclass after chaining constructors in base class

[Abhinav Tripathi]

Follow-up Comment #3, bug #49421 (project octave):

Apparently we will have to copy each property from base to derived for this to
work (just a work-around).. I have to change the derived class to the
following then it works perfectly:  
```
classdef derived < base
  properties
    z;
  end
  methods
    function self = derived (a, b, c)
        if nargin<3
            c = 42;
        end
        if nargin<2
            b = pi;
        end
        if nargin<1
            a = 0;
        end
      s = base (a, b);
      self = derived.copy(self, s);
      self = builtin ('subsasgn', self, substruct ('.', 'z'), c);
    end
  end
  
  methods(Static)
       function obj = copy(obj,superobj)
          prop = properties(superobj);
          for i = 1:length(prop)
              obj.(prop{i}) = superobj.(prop{i});
          end
       end
  end
end
```

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