commit 4ca060d8ad7c6df1fd4df30f9a14f6aa35380c09
author Terry Jan Reedy <tjreedy@udel.edu> Sun Mar 08 15:30:04 2020 -0400
committer GitHub <noreply@github.com> Sun Mar 08 15:30:04 2020 -0400
tree 98ed28d77a76cf19434ec03a464b2fb862d515e4
parent 2522db11df102be3baf25ce9e816ebe8ffdb7fcc

 bpo-39885: IDLE context menu clears selection  (#18859)

Since clicking to get an IDLE context menu moves the cursor,
any text selection should be and now is cleared.

Lib/idlelib/editor.py

diff --git a/Lib/idlelib/editor.py b/Lib/idlelib/editor.py
index 5b81b52..5194190 100644
--- a/Lib/idlelib/editor.py
+++ b/Lib/idlelib/editor.py
@@ -499,6 +499,7 @@
     rmenu = None
 
     def right_menu_event(self, event):
+        self.text.tag_remove("sel", "1.0", "end")
         self.text.mark_set("insert", "@%d,%d" % (event.x, event.y))
         if not self.rmenu:
             self.make_rmenu()