Remove nonfunctional Axes3D.set_frame_on and get_frame_on methods. (matplotlib#25648)

Author: saranti

doc/api/next_api_changes/removals/25648-TS.rst

@@ -0,0 +1,6 @@
+``Axes3D.set_frame_on`` and ``Axes3D.get_frame_on`` removed
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+``Axes3D.set_frame_on`` is documented as "Set whether the 3D axes panels are
+drawn.". However, it has no effect on 3D axes and is being removed in
+favor of ``Axes3D.set_axis_on`` and ``Axes3D.set_axis_off``.

doc/api/toolkits/mplot3d/axes3d.rst

@@ -77,8 +77,6 @@ Appearance
    set_axis_off
    set_axis_on
    grid
-   get_frame_on
-   set_frame_on
 
 
 Axis

lib/mpl_toolkits/mplot3d/axes3d.py

@@ -1319,20 +1319,10 @@ def get_zlabel(self):
 
     # Axes rectangle characteristics
 
-    def get_frame_on(self):
-        """Get whether the 3D axes panels are drawn."""
-        return self._frameon
-
-    def set_frame_on(self, b):
-        """
-        Set whether the 3D axes panels are drawn.
-
-        Parameters
-        ----------
-        b : bool
-        """
-        self._frameon = bool(b)
-        self.stale = True
+    # The frame_on methods are not available for 3D axes.
+    # Python will raise a TypeError if they are called.
+    get_frame_on = None
+    set_frame_on = None
 
     def grid(self, visible=True, **kwargs):
         """