gh-151910: Note Treeview.size shadows the inherited grid_size alias

Treeview.size overrides the inherited size = grid_size alias, like
Treeview.bbox overrides grid_bbox.  Mark it with an "overrides Misc.size"
comment and list ttk.Treeview alongside Listbox in the documentation of
the size/grid_size alias.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: serhiy-storchaka

Doc/library/tkinter.rst

@@ -1391,8 +1391,9 @@ Base and mixin classes
       ``(columns, rows)`` tuple.
 
       :meth:`size` is an alias of :meth:`!grid_size`,
-      except on the :class:`Listbox` widget,
-      which provides its own :meth:`!size` method.
+      except on :class:`Listbox` and
+      :class:`ttk.Treeview <tkinter.ttk.Treeview>`,
+      which provide their own :meth:`!size` method.
 
    .. method:: grid_slaves(row=None, column=None)
 
@@ -3291,8 +3292,9 @@ Base and mixin classes
       Same as :meth:`Misc.grid_size`: return a ``(columns, rows)`` tuple giving
       the size of the grid.
       :meth:`size` is an alias of :meth:`!grid_size`,
-      except on the :class:`Listbox` widget,
-      which provides its own :meth:`!size` method.
+      except on :class:`Listbox` and
+      :class:`ttk.Treeview <tkinter.ttk.Treeview>`,
+      which provide their own :meth:`!size` method.
 
    .. method:: propagate()
                propagate(flag)

Lib/tkinter/ttk.py

@@ -1457,7 +1457,7 @@ def visible(self, item):
         return self.tk.getboolean(self.tk.call(self._w, "visible", item))
 
 
-    def size(self, item, *, hidden=False, recurse=False):
+    def size(self, item, *, hidden=False, recurse=False):  # overrides Misc.size
         """Return the number of children of item.
 
         If hidden is true, hidden items are included.  If recurse is true,