Deprecate set_pane_pos

Author: oscargus

doc/api/next_api_changes/deprecations/23647-OG.rst

@@ -0,0 +1,6 @@
+``mplot3d.axis3d.Axis.set_pane_pos``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+... is deprecated. This is an internal method where the provided values are
+overwritten during drawing. Hence, it does not serve any purpose to be
+directly accessible.

lib/mpl_toolkits/mplot3d/axis3d.py

@@ -182,7 +182,11 @@ def get_minor_ticks(self, numticks=None):
                 obj.set_transform(self.axes.transData)
         return ticks
 
+    @_api.deprecated("3.6")
     def set_pane_pos(self, xys):
+        self._set_pane_pos(xys)
+
+    def _set_pane_pos(self, xys):
         xys = np.asarray(xys)
         xys = xys[:, :2]
         self.pane.xy = xys
@@ -290,7 +294,7 @@ def draw_pane(self, renderer):
         else:
             plane = self._PLANES[2 * index + 1]
         xys = [tc[p] for p in plane]
-        self.set_pane_pos(xys)
+        self._set_pane_pos(xys)
         self.pane.draw(renderer)
 
         renderer.close_group('pane3d')