[issue9214] Most Set methods of KeysView and ItemsView do not work right

[Daniel Urban]

Daniel Urban <urban.dani+py at gmail.com> added the comment:

> P.S. Please let me know how to detect such issues in future patches.

In some editors there is an option "Remove trailing spaces" or something like that. Also, some editors (for example Kate) show trailing spaces.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9214>
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