bpo-46591: Make About IDLE doc link label clickable (GH-30251)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

Lib/idlelib/NEWS.txt

@@ -4,6 +4,8 @@ Released on 2022-10-03
 =========================
 
 
+bpo-46591: Make the IDLE doc URL on the About IDLE dialog clickable.
+
 bpo-45296: Clarify close, quit, and exit in IDLE.  In the File menu,
 'Close' and 'Exit' are now 'Close Window' (the current one) and 'Exit'
 is now 'Exit IDLE' (by closing all windows).  In Shell, 'quit()' and

Lib/idlelib/help_about.py

@@ -3,6 +3,7 @@
 """
 import os
 import sys
+import webbrowser
 from platform import python_version, architecture
 
 from tkinter import Toplevel, Frame, Label, Button, PhotoImage
@@ -94,6 +95,7 @@ class AboutDialog(Toplevel):
                      f"{version[:version.rindex('.')]}/library/idle.html",
                      justify=LEFT, fg=self.fg, bg=self.bg)
         docs.grid(row=7, column=0, columnspan=2, sticky=W, padx=10, pady=0)
+        docs.bind("<Button-1>", lambda event: webbrowser.open(docs['text']))
 
         Frame(frame_background, borderwidth=1, relief=SUNKEN,
               height=2, bg=self.bg).grid(row=8, column=0, sticky=EW,

Lib/idlelib/idle_test/htest.py

@@ -77,8 +77,8 @@ AboutDialog_spec = {
     'kwds': {'title': 'help_about test',
              '_htest': True,
              },
-    'msg': "Test every button. Ensure Python, TK and IDLE versions "
-           "are correctly displayed.\n [Close] to exit.",
+    'msg': "Click on URL to open in default browser.\n"
+           "Verify x.y.z versions and test each button, including Close.\n "
     }
 
 # TODO implement ^\; adding '<Control-Key-\\>' to function does not work.

Misc/NEWS.d/next/Library/2022-01-31-15-40-38.bpo-46591.prBD1M.rst

@@ -0,0 +1 @@
+Make the IDLE doc URL on the About IDLE dialog clickable.