Issue #4710

Closes #4707

The original character class `[^\\\[\\]]` escapes `\\` instead of `\]`
(e.g. it would be the character class `[^\\\[]` followed by a `]`
which I think is wrong).

Closes #4701

Issue #4622

Dart 1.22 added a new keyword: covariant. http://news.dartlang.org/2017/02/dart-122-faster-tools-assert-messages.html

To work with Chrome's overlay scrollbars

Issue #4676

We use Code Mirror for our code editor at Codevolve.

Issue #4697

Issue #4694

To make auto closing of quotes work

Issue #4694

Issue #4693

Destructor are now parsed the same way as constructor.

Closes #4688

Closes #4686