Closes #1518

Other properties will be added/overridden in the config object for the
mime type.

Issue #1525

It makes no sense.

Issue #1466

Closes #1522

Closes #1516

This prevents it from being repainted whenever the height of the inner
editor briefly changes during a repaint. (At least, it does on Webkit).

Issue #1514

Previously, they'd fire multiple times when an update didn't immediately
become stable.

Makes "backtracking" matches match the forward search matches.
Fixes "0 or more" '\w*' type searches

Plus extra test cases.

Closes #1512

When a level 2 section intersected with a level 0 one, an
assumption in the visual motion code was violated, resulting
in bogus motion and thus infinite loops in the charCoords code.

Closes #1510

Closes #1508

Closes #1461

Closes #1498

Closes #1501

WebKit does not honor autocorrect=off, but it does honor
spellcheck=false.

The below conforms to Vim's behavior regarding whitespace trimming.