That overlay modes can use to access the underlying token info.

Closes #4878.

Issue #4926

We really need to get rid of PhantomJS

Which Phantom doesn't parse yet

Issue #4926

Issue #4926

See #4872.

Issue #4868

Issue #4839

Closes #4839

This way, only one char's left and right edges are used, instead of its
(logical) neighbour's right edges.

In bidi content, this avoids trying to scroll to two logically close,
but visually far apart positions in some situations.

This reverts commit e7b737c8.

into a form that CodeMirror can understand.

Since moving the highlighting frontier forward when doing
things like getTokenAt is not safe at all.

Also properly update highlighting frontier when a change
happens.

Since the vim bindins are depending on that

FEATURE: Mouse button clicks can now be bound in keymaps by using
names like `"LeftClick"` or `"Ctrl-Alt-MiddleTripleClick"`. When bound
to a function, that function will be passed the position of the click
as second argument.

FEATURE: The behavior of mouse selection and dragging can now be
customized with the
[`configureMouse`](http://codemirror.net/doc/manual.html#option_configureMouse)
option.

To avoid false negatives due to window scrolling

Which often caused strangeness around empty lines

Issue #4307

Since rollup is now adding those