* [bpo-21315](https://bugs.python.org/issue21315): Fix parsing of encoded words with missing leading ws.
Because of missing leading whitespace, encoded word would get parsed as
unstructured token. This patch fixes that by looking for encoded words when
splitting tokens with whitespace.
Missing trailing whitespace around encoded word now register a defect
instead.
Original patch suggestion by David R. Murray on [bpo-21315](https://bugs.python.org/issue21315).
(cherry picked from commit 66c4f3f38b)
Co-authored-by: Abhilash Raj <maxking@users.noreply.github.com>
(cherry picked from commit dc20fc4311)
Co-authored-by: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
https://bugs.python.org/issue21315
59e8fba718