PR: Do not overwrite unmatched braces

[timhoffm]

Fixes #5588

Sorry for the two char indentation, but the strict 80 char line limit give me really a hard time here. I don't see how one could format this reasonably otherwise without changing functionality (i.e. pre-evaluating cursor.block().text() and/or __unmatched_braces_in_line() even when that is not necessary because of not key_matches_next_char).

[pep8speaks]

Hello @timhoffm! Thanks for submitting the PR.

• In the file spyder/widgets/sourcecode/codeeditor.py, following are the PEP8 issues :

Line 2900:15: E128 continuation line under-indented for visual indent

[rlaverde]

It looks good to me, and works as expected

Thanks @timhoffm for working in this, could you add a test for it?

[rlaverde]

LGTM, I think that the travis error is unrelated to this PR

[ccordoba12]

Yep, that's right.

Thanks @timhoffm for your contribution!