Fix Annulus width check (matplotlib#27811)

* Update patches.py

Fix check on annulus width to reflect the error message printed. The logic is presented in this (slightly) convoluted form to better conform with the error message. Obviously, `if min(self.a, self.b) < width:` works just as well.

This fix will allow annuli to be equivalent to Circles (in terms of area plotted, not underlying object structure). This means plotting (`_recompute_path`, I believe) could be improved by checking for `if w==a or w==b: PLOT WITHOUT HOLE`. Not sure how that would work, but everything does seem to work even without that change.

* Update lib/matplotlib/patches.py

We're in agreement on this.

Co-authored-by: Tim Hoffmann <2836374+timhoffm@users.noreply.github.com>

* Update lib/matplotlib/patches.py

Co-authored-by: Elliott Sales de Andrade <quantum.analyst@gmail.com>

---------

Co-authored-by: Tim Hoffmann <2836374+timhoffm@users.noreply.github.com>
Co-authored-by: Elliott Sales de Andrade <quantum.analyst@gmail.com>

Author: 3 people

lib/matplotlib/patches.py

@@ -1840,9 +1840,9 @@ def set_width(self, width):
         ----------
         width : float
         """
-        if min(self.a, self.b) <= width:
+        if width > min(self.a, self.b):
             raise ValueError(
-                'Width of annulus must be less than or equal semi-minor axis')
+                'Width of annulus must be less than or equal to semi-minor axis')
 
         self._width = width
         self._path = None