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Fix bbox of polar Axes #29051

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@QuLogic QuLogic commented Oct 31, 2024

PR summary

Polar Axes previously scaled its position into an equal area box; this was a simplification in order to preserve the aspect ratio. Now the actual position is modified to fill the requested position, while modifying the aspect ratio so that the box is tight to the polar wedge.

Also, this tweaks the positioning of the x/y labels so that they won't overlap the ticks. Note on polar axes, these are not aligned with the actual Axis, but just in the place they would be for a Cartesian Axes. I think making them aligned to the Axis would be a good idea, but is something larger that we'd have to possibly copy from mpl_toolkits.

Fixes #10264

PR checklist

Instead of generating a throwaway `Wedge` class to calculate the
boundaing box for sizing, re-use the one that is the `Axes` patch
(unless it was never set). This also removes the redundant
re-calculation to resize the `Axes` patch during draw.

This does in turn require tweaking the transform, as the calculation
uses a slightly different domain, but it should be more robust to
changes in the bbox calculation.
No longer expand the wedge bbox to make a square, but instead export at
whatever size it has. Then also apply its aspect ratio to the Axes
itself, so that the Axes' 'active' position is correct.

This allows wedge-shaped PolarAxes to expand to fill their allocated
space.
Since these labels are currently just an x/y analog (and not tied to the
axis orientation), they need to "see" the other axis in order to avoid
overlap.
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Wedged polar plot's position/scaling leaves too much white space.
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