Closes #3569

Issue #3586

Issue #3548

Fixes #3449

Issue #3423

... and export (via defineExtension) a method to explicitly trigger
linting from user code.

Issue #3337
Issue #3338

Spent quite a while perfecting this (IMO), but a lot of people seem to
really like it. Hope you do too.

Issue #3320

https://github.com/codemirror/CodeMirror/pull/3212

Closes #3159

Issue #3053

See http://discuss.codemirror.net/t/simple-mode-and-anchored-regexp/88/4

This file was taken from
https://github.com/wisenomad/zenburn-lighttable-theme with a few
modifications to make it work in CodeMirror

Allows convenient showing of panels (DOM nodes) above or
below an editor, automatically shrinking the editor to make
space.

And manually compensate for our own scrollbar sizes.

This way, we're no longer dependent on the size of our scrollbars
being the same as the size of native scrollbars, and can start to
think about custom scrollbars.

As long as CodeMirror.normalizeKeyMap is called on them before they are
used. This interface is a little weird, but backwards-compatible.

And adjust vim mode to use these.

If "{{" was found, the code would highlight the rest of the line
regardless if a matching "}}" or "}}}" was found.