- Adjusting indent of pasted block to current line
- Handle multi-line case, subsequent lines have their indent adjusted by their offset
to the first line.
- Add two tests for ]p to demonstrate this.
- Add [p to indent paste above

Use CreateInsertModeChanges to make a copy of the latest
insert mode changes in pushInsertModeChanges so that the
latest insert mode changes can safely be modified without
bashing previously recorded macros.

Fix the :register command and add unit tests. Add a fakeOpenNotification for matching the notification text.

In Vim, defaults keymap cannot be unmapped. They must be explicityly
set to <NOP>. In this case we allow that because
user defined maps are stored in the same map as the defaults.

Issue #2283

1) Fix a bug whereby multiple '\'es in the replace part of a search and replace
string were getting collapsed into a single one.
2) Split flipEscaping into two specialized functions -- one for the regex part,
and one for the replace part.

... so that users can use \1, \2, etc in the replace expressions.

... so that '|' can be used as an OR in regular expressions or as a literal
character, depending on whether it was escaped or not.

1) fix the escaping of '(' and ')' in search expressions.
2) get the correct placement of the '\' in characters that need to introduce escaping.
3) change the capture unit test to expect that '(' and ')' should be escaped, as does real vim.

adds escaping for '|' to bridge a difference between javascript and
vim regex flavors.

take the escaping a little lower level so that it affects '/' searches
as well, not just '%s/<regex>/<replacement>' searches.

Previously commands like da<object> only worked with the opening side of the
pair, so you could do da{ but not da}.

I also removed some duplication of calls to selectCompanionObject (at the cost
of switching from map lookup to an if-else chain).

Add unit tests.

Return null from moveTillCharacter if nothing is found, so that if a
deletion operation is active but no match was found, nothing gets
deleted. Add a unit test for moveTillCharacter.

Also fixed a bug in context matching.

When the last line in an editor has no newline char at the end, yanking it
line-wise should append one. So the last char will not be dropped when
pasting it.

Issue #1084
Issue #1630

Closes #1612