bpo-1529353: IDLE - Squeezer What's New for 3.8 (#9572)

Author: terryjreedy

Doc/whatsnew/3.8.rst

@@ -121,6 +121,20 @@ asyncio
 
 On Windows, the default event loop is now :class:`~asyncio.ProactorEventLoop`.
 
+
+idlelib and IDLE
+----------------
+
+Output over N lines (50 by default) is squeezed down to a button.
+N can be changed in the PyShell section of the General page of the
+Settings dialog.  Fewer, but possibly extra long, lines can be squeezed by
+right clicking on the output.  Squeezed output can be expanded in place
+by double-clicking the button or into the clipboard or a separate window
+by right-clicking the button.  (Contributed by Tal Einat in :issue:`1529353`.)
+
+The changes above have been backported to 3.7 maintenance releases.
+
+
 os.path
 -------