Close #1066
Close #1068

Close #1055

Prevents the following case:
before pathshorten - /usr/bin
after pathshorten - /u/bin
piped to cmd.exe - U:/bin

Port of https://github.com/junegunn/fzf.vim/commit/e7928d154aad71e530daf5c17733275da5732680

Since :FZF does not enable preview window, we determine based on full
&columns instead of &columns / 2.

Temporary workaround for non-Windows environment

Reference:
https://github.com/vim/vim/issues/1998
https://github.com/junegunn/fzf/pull/1019#issuecomment-327008348

IMPORTANT:
cmd.exe and powershell are fine in default Windows terminal.
cmd.exe prompt is broken on ConEmu because it natively supports ucs-2 only.
utf-16 support is exclusive to .Net (ie. powershell).
utf-8 supports requires chcp, external program, but does not fix the cmd.exe prompt.
Use powershell on ConEmu to avoid corrupted text on display

Requirements:
- compiled with +terminal
- has patch-8.0.995
- has('gui_running') returns 1

Original Patch: https://github.com/junegunn/fzf/commit/a9bf29b65ec36d9caa7298aad0322fba8cb3e130

Close #1031

Previously a command like `echo a && echo b` would get transformed into
`echo a && echo b | fzf`, which only pipes the output of the second
command. Adding parentheses around the source command avoids this issue,
and works on both Unix and Windows.

Close #1023

https://github.com/junegunn/fzf.vim/issues/185

Close #1005

Close #1000

https://github.com/junegunn/fzf.vim/issues/396#issuecomment-317214036

One can override the setting on FileType fzf autocmd.

Fix https://github.com/junegunn/fzf.vim/issues/404

Thanks to @janlazo.

Related: #960 (relative filepaths)

Related #960, #552

See https://github.com/junegunn/fzf/pull/933#discussion_r120011934

Close https://github.com/junegunn/fzf.vim/pull/386

Related: https://github.com/junegunn/fzf.vim/issues/378

expand() may return an empty string depending on the value of
&wildignore. Since expand('<sfile>') always returns an absolute path, we
can remove expand() call here. Close #917.

https://github.com/junegunn/fzf.vim/issues/361

Preview script cannot properly determine the height of fzf finder if
`--height` option is used.

https://github.com/junegunn/fzf.vim/issues/361

- Fix shellescaping issues for filepaths
    - Supports both forward slashes or backslashes
    - Paths with spaces
- Use jobstart for neovim in s:execute (Windows)
    - https://github.com/neovim/neovim/pull/6497
- Make 2 s:fzf_shellescape functions
    - (Windows) Substitute \" with \\" to escape the last backslash
    - (Default) Regular shellescape
- Support list 'options'
- Add "@Echo off" to the batchfile used to execute fzf

This displays the buffer(s) in this case, which is useful when FZF got
stuck, and you have to manually remove the buffer.

https://github.com/junegunn/fzf.vim/issues/327
https://github.com/junegunn/fzf.vim/issues/317

Close https://github.com/junegunn/fzf.vim/issues/308

- call fzf#run({'source': "echo '!'"})
- call fzf#run({'source': "echo '!'", 'down': '40%'})

Close https://github.com/junegunn/fzf.vim/issues/315