Issue #4162

When persistent search dialog is open, looking up commands for findNext/
Prev keys would only search the current keyMap. This commit changes this
to also look up commands in extraKeys

Searching with findPersistentNext or findPersistentPrev will
immediately run a search with the previous query, however it will throw
and error if no previous query exists. This commit fixes by preventing
the immediate execution if no previous query is set

To match the actual match-highlights in the editor.

Issue #4050

Closes #3972

Closes #3920

When enabled, and the annotatescrollbar addon is loaded, matches will
be shown on the scrollbar.

To avoid IE8 parser issue.

Issue #3682

Issue #3431

Issue #3431

Issue #3431

Closes #3456

Issue #3337

Issue #3337
Issue #3338

Issue #3204

Both to the annotateScrollbar and to the editor itself.

Issue #3079

Closes #2776

Disable the `replace()` when the selected `CodeMirror` is `readOnly`.