Fix types for MarkerStyle

It is not possible for `get_marker` to return another `MarkerStyle`; the
`__init__` only takes one to make a full copy of it. And `get_alt_path`
is only available for e.g., half-filled markers, but not all.

Author: QuLogic

lib/matplotlib/markers.py

@@ -161,11 +161,11 @@ class MarkerStyle:
 
     Attributes
     ----------
-    markers : list
+    markers : dict
         All known markers.
-    filled_markers : list
+    filled_markers : tuple
         All known filled markers. This is a subset of *markers*.
-    fillstyles : list
+    fillstyles : tuple
         The supported fillstyles.
     """
 

lib/matplotlib/markers.pyi

@@ -37,10 +37,10 @@ class MarkerStyle:
     def get_fillstyle(self) -> FillStyleType: ...
     def get_joinstyle(self) -> Literal["miter", "round", "bevel"]: ...
     def get_capstyle(self) -> Literal["butt", "projecting", "round"]: ...
-    def get_marker(self) -> str | ArrayLike | Path | MarkerStyle | None: ...
+    def get_marker(self) -> str | ArrayLike | Path | None: ...
     def get_path(self) -> Path: ...
     def get_transform(self) -> Transform: ...
-    def get_alt_path(self) -> Path: ...
+    def get_alt_path(self) -> Path | None: ...
     def get_alt_transform(self) -> Transform: ...
     def get_snap_threshold(self) -> float | None: ...
     def get_user_transform(self) -> Transform | None: ...