Make annotate/OffsetFrom unaffected by later mutation of coordinates. #26466
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The unpacking (
x, y = xy
) is safe wrt. units (we already perform the same unpacking later when actually computing coordinates) and prevents later mutation of the input array from affecting the artist (or the OffsetFrom instance), which is consistent with other artists.While at it, also inline OffsetFrom._get_scale, which is a one-liner.
Closes #17566; supersedes #17567.
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