[Octave-bug-tracker] [bug #39495] polar plot should have a circular rho/theta axis

[Rik]

Follow-up Comment #17, bug #39495 (project octave):

I would be fine committing the last diff if you like.

I think we should probably address the FIXME note about not overriding
existing axis preferences if ishold is on.  For example, when I use hold on
and call polar several times I end up with several copies of the polar
hggroup.  It would be better to just keep a single copy and adjust it as
necessary.

Maybe test ishold and if it is on, look for an hggroup with the tag
"polar_grid".  If it exists we can update it rather than create a new one.

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