bpo-4630: Add cursor no-blink option for IDLE (GH-16960)


This immediately toggles shell, editor, and output windows, but does not affect other input widgets.
(cherry picked from commit 9c2844927d15b2d3e21b28d62249dead02b5b597)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>
diff --git a/Lib/idlelib/config.py b/Lib/idlelib/config.py
index 12e6f9f..04444a3 100644
--- a/Lib/idlelib/config.py
+++ b/Lib/idlelib/config.py
@@ -158,6 +158,8 @@
         self.defaultCfg = {}
         self.userCfg = {}
         self.cfg = {}  # TODO use to select userCfg vs defaultCfg
+        # self.blink_off_time = <first editor text>['insertofftime']
+        # See https:/bugs.python.org/issue4630, msg356516.
 
         if not _utest:
             self.CreateConfigHandlers()