bpo-38689: avoid IDLE hanging when calltip fails getting a signature (GH-17152)
Inspect.signature failed on the test case because its isinstance call raised.
diff --git a/Lib/idlelib/NEWS.txt b/Lib/idlelib/NEWS.txt
index 3a4873b..46b1523 100644
--- a/Lib/idlelib/NEWS.txt
+++ b/Lib/idlelib/NEWS.txt
@@ -3,6 +3,9 @@
======================================
+bpo-38689: IDLE will no longer freeze when inspect.signature fails
+when fetching a calltip.
+
bpo-27115: For 'Go to Line', use a Query entry box subclass with
IDLE standard behavior and improved error checking.