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PR summary
This is implicitly tested via all plots and layout. However, this makes it difficult to work on the transform stack directly (cf #22191), which these tests rectify.
I deliberately chose points/angles that were easy to work out in my head, so hopefully there are not any edge cases that were missed here. (Except for
skew
, for which I don't have an inherent idea of what that transform looks like, so I admit to just copy-pasting the existing output there.)PR checklist