[bug #48518] No warning for singular diagonal matrices

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Follow-up Comment #3, bug #48518 (group octave):

I'm not sure I understand what you mean by "non-diagonal matrix". But `M` is
still a diagonal matrix for me after that assignment with the Octave 11 RC2.
And I still don't get a warning:

octave:4> M = eye(2)
M =

Diagonal Matrix

   1   0
   0   1

octave:5> M(2,2) = 0
M =

Diagonal Matrix

   1   0
   0   0

octave:6> M \ [1;1]
ans =

   1
   0

octave:7> version
ans = 11.0.92
octave:8>



Did something change on the stable branch since the RC2 that transforms the
diagonal matrix to a full(?) matrix on that assignment now?



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