Add what's new entry

ericpre · ericpre · commit 403972b2e3f1 · 2021-08-25T09:29:42.000+01:00
diff --git a/doc/users/next_whats_new/rectangleselector_square_center.rst b/doc/users/next_whats_new/rectangleselector_square_center.rst
@@ -0,0 +1,7 @@
+Rectangle selector square shape and centering
+---------------------------------------------
+
+When changing an existing `~matplotlib.widgets.RectangleSelector` interactively,
+the shape can now be kept square or changed around its center. The square shape
+can be defined in data or figure coordinates as determined by the
+``data_coordinates`` modifier.
