Terry J. Reedy added the comment:

The current behavior of IDLE's feature is standard, not a bug.  The cpython 
respository does not currently accept .py, .c, or .rst files with any trailing 
whitespace.  <pythondir>/tools/scripts/patchcheck.py strips trailing whitespace 
from all lines.  Notepad++, a widely used multi-language Windows programmer's 
editor, does the same.

I am aware of the potential surprise.  If one wants multiline strings with 
embedded trailing whitespace, one should avoid trailing whitespace strippers or 
use Python's string concatenation feature. 
>>> s = ('space \n' 'tab\t\n' 'line3\n')
>>> s
'space \ntab\t\nline3\n'

I am revising the doc to make the rstring behavior clearer.

----------
stage:  -> patch review
title: IDLE 'strip trailing whitespace' changes the value of multiline strings 
-> IDLE 'strip trailing whitespace' changes multiline strings
versions: +Python 3.7

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31477>
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