Remove off-by-one in vim when head is further forward in the document than the anchor, where vim's selection becomes 1 less than CodeMirror's. This was originally done because the cursor showed past the anchor and looked like an additional character selection.

It's intended to match a literal `{`, but that must be escaped as it's
a meta character in JS regex.

Issue #2624

Issue #2622

Closes #2619

Issue #2604

Closes #2598

Fixes #2596

This reverts commit 4b047883.

Issue #2587

Issue #2587

Issue #2594

The issue can be seen on http://codemirror.net/mode/clike/index.html. In the C++ raw_string line, place the cursor after 'delim(' and type '('. Currently this causes a regexp error, which this patch fixes.

Issue #2562

This fixes non-empty selections having 2 highlights: the selection highlight
and the active-line highlight. Non-empty selections should only have the
selection highlight.

The editor instances will inherit them from there.

Issue #2573

Issue #2573

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