[Matplotlib-users] add round corner for patches.Rectangle, not with FancyBboxPatch

[orange si]

hi everyone,
    I see the FancyBboxPatch can add round corner  in
https://matplotlib.org/gallery/shapes_and_collections/fancybox_demo.html ,
but that has some space between the rectangle and the fancybox. And I just
want to add round corner instead of the sharp corner for Rectangle, not to
expand the rectangle region.
    That confused me a few days, thanks for any help~

Best Regards
Si
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