Bug report

Bug summary

As described in#20012, the current default theta tick locator behaves less than optimally for non-full-circle polar plots.#20012 partially fixes the issue, but still leaves some holes. A possible better design was suggested at#20012 (comment) (and following comments).

Another thing to consider may be to try to reuse the implementations in axisartist.angle_helper.

Code for reproduction
Actual outcome
Expected outcome

See#20012.

Matplotlib version

• Operating system: linux
• Matplotlib version (import matplotlib; print(matplotlib.__version__)): 3.4
• Matplotlib backend (print(matplotlib.get_backend())): any
• Python version: 39
• Jupyter version (if applicable):
• Other libraries: