Invoking fzf from an existing Vim popup terminal is a special case.
It requires some new code to avoid E994 from being raised and the user
being stuck in a non-closable popup window.

Fix #1916

At the top of each zsh file options are set to their
standard values (those marked with <Z> in `man zshoptions`)
and `aliases` option is disabled.

At the bottom of the file the original options are restored.

Fix #1938 

Close #1940
Related: #1363 #749 #270 #49 #88 #492 #600

Fix #1926

Close #1652

To make it easier to write more complex fzf options. Although this
does not break backward compatibility, users are encouraged to update
their code accordingly.

  # Before
  _fzf_complete "FZF_ARG1 FZF_ARG2..." "$@" < <(
    # Print candidates
  )

  # After
  _fzf_complete FZF_ARG1 FZF_ARG2... -- "$@" < <(
    # Print candidates
  )

Co-authored-by: Junegunn Choi <junegunn.c@gmail.com>

Separate Unix & Windows code into platform specific files for light renderer

- https://travis-ci.org/junegunn/fzf/jobs/659496745#L676

Related #1900

This change allows the completion system of bash and zsh to return
before the input process completes.

Related #1887

This might help with #1456 where fzf hangs consuming CPU resources.

--border option now takes an optional argument that defines the style

  - rounded (new default)
  - sharp
  - horizontal (previous default)

Make sure that the shell is ready before hitting CTRL-R

      1) Error:
    TestFish#test_ctrl_r_multiline:
    RuntimeError: timeout
        test/test_go.rb:50:in `wait'
        test/test_go.rb:125:in `until'
        test/test_go.rb:1857:in `test_ctrl_r_multiline'

Fix #1418

e.g.
  call fzf#run({'source': [1, 2, 3], 'down': '~50%', 'options': "--border --header $'1\n2'"})

- OSC Ps ; Pt BEL
- OSC Ps ; Pt ST

Fix #1415

https://github.com/junegunn/fzf.vim/issues/943
https://github.com/junegunn/fzf.vim/issues/959

- Prefix matcher will trim leading whitespaces only when the pattern
  doesn't start with a whitespace
- Suffix matcher will trim trailing whitespaces only when the pattern
  doesn't end with a whitespace
- Equal matcher will trim leading whitespaces only when the pattern
  doesn't start with a whitespace, and trim trailing whitespaces only
  when the pattern doesn't end with a whitespace

Previously, only suffix matcher would trim whitespaces unconditionally.

Fix #1894

Fix #1898

Restore the original line when search is aborted. Add --query
"$READLINE_LINE" and fall back to the current behavior pre Bash 4.

Co-authored-by: Junegunn Choi <junegunn.c@gmail.com>

- Fix 'make docker-test'
- Set fish_history to an empty string since 'fish --private' is not
  available prior to fish 3.0

'backward-delete-char/eof' will either abort if query is
empty or delete one character backwards.

Close #1744

Close #1370 

Parses the history list, converts it to a NUL-delimited list of possibly
multiline entries. Adds the fzf --read0 option. Works with and without
histexpand enabled.

Co-authored-by: Junegunn Choi <junegunn.c@gmail.com>

Make C-t more consistent pre and post Bash 4. It already kills the
command line separately before and after the insertion point. Add
set-mark and exchange-point-and-mark to restore the insertion point
after yanking back and apply the same behavior to M-c.

* CTRL-T should put extra space after pasted items

Co-authored-by: Junegunn Choi <junegunn.c@gmail.com>

Be consistent with emacs mode and put the items at the point vs. the end
of the command line.