bpo-35555: IDLE: Gray out Code Context menu item on non-editors (#11282)

The Code Context menu item only works on Editor windows so disable it for others.

Lib/idlelib/NEWS.txt

@@ -3,6 +3,8 @@ Released on 2019-10-20?
 ======================================
 
 
+bpo-35555: Gray out Code Context menu entry when it's not applicable.
+
 bpo-22703: Improve the Code Context and Zoom Height menu labels.
 The Code Context menu label now toggles between Show/Hide Code Context.
 The Zoom Height menu now toggles between Zoom/Restore Height.

Lib/idlelib/outwin.py

@@ -78,6 +78,8 @@ class OutputWindow(EditorWindow):
         EditorWindow.__init__(self, *args)
         self.text.bind("<<goto-file-line>>", self.goto_file_line)
         self.text.unbind("<<toggle-code-context>>")
+        self.menudict['options'].entryconfig('*Code Context',
+                                             state='disabled')
 
     # Customize EditorWindow
     def ispythonsource(self, filename):

Misc/NEWS.d/next/macOS/2018-12-21-18-44-30.bpo-35555.M58_K3.rst

+Gray out Code Context menu entry when it's not applicable.