Issue #1960

`cm-s-ambiance` and `CodeMirror-focused` are classes to the same
element, so search for `.cm-s-ambiance .CodeMirror-focused` will fail.

Issue #1947

It's possible to provide custom markup for hint elements that are LI
tags and that breaks event delegation logic that expects UL to have
text-only LI nodes. As a result if you have elements inside LI and
click/dblclick on those, nothing happens and selected hint is not
applied. The fix improves event delegation in the way to find nearest
parent element to event target that is a hint element at the same time.

Issue #1943

As a result, the common pattern

import (
	"foo"
	"bar"
	)

will re-indent automatically to the gofmt-blessed

import (
	"foo"
	"bar"
)

Closes #1925.

The C editor and the C++ editor have the same variable name, so
the latter shadows the former. Fixed by renaming both.

Closes #1920.

Remove callback argument, save currently open dialog in per-editor state.

Issue #1935

Closes #1934

Issue #1932

Issue #1932

Closes #1826

Issue #1926