Instead of drawing the window border in Vim using an extra window,
extend the --border option so that we do can it natively.

Close #2223
Fix #2184

New color name: input

Close #1663

Fixes #2163, though this is not a proper fix to the problem.

Close #2211

  fzf --preview 'for i in $(seq 100000); do
    (( i % 200 == 0 )) && printf "\033[2J"
    echo "$i"
    sleep 0.01
  done'

We were not properly waiting for truthy-ness in until blocks.

Need Minitest with https://github.com/seattlerb/minitest/commit/21d9e804b63c619f602f3f4ece6c71b48974707a

Close #2217

  seq 100 | fzf
    # 100/100
  seq 100 | fzf --multi
    # 100/100 (0)
  seq 100 | fzf --multi 5
    # 100/100 (0/5)

Fix #2212

    # Will start rendering after 200ms, update every 100ms
    fzf --preview 'for i in $(seq 100); do echo $i; sleep 0.01; done'

    # Should print "Loading .." message after 500ms
    fzf --preview 'sleep 1; for i in $(seq 100); do echo $i; sleep 0.01; done'

    # The first line should appear after 200ms
    fzf --preview 'date; sleep 2; date'

    # Should not render before enough lines for the scroll offset are ready
    rg --line-number --no-heading --color=always ^ |
      fzf --delimiter : --ansi --preview-window '+{2}-/2' \
          --preview 'sleep 1; bat --style=numbers --color=always --pager=never --highlight-line={2} {1}'

Fix https://github.com/junegunn/fzf.vim/issues/1131

Fixes error when option-like args are parsed (e.g. "-1").

    # Should properly escape arguments
    FZF_DEFAULT_OPTS='--prompt "\$a`b\"c"' fzf-tmux --header $'$a\nb"c`d'

Close #2203

Fix #2203

e.g. --preview-window sharp --preview-window cycle

Close #2182

Ideally, we could only use `print -sr` to update the command history.
However, the "cd" command by ALT-C is added to the history only after we
finalize the current command by pressing an additional enter key.

i.e. The cd command from ALT-C is not visible when you hit Up arrow. But
it appears once you hit enter key.

So when the current buffer is empty, we use `zle accept-line` so that
the command history is immediately updated.

Close #2200

Fix #2017

The new default is

  { 'window' : { 'width': 0.9, 'height': 0.6, 'highlight': 'Normal' } }

The default highlight group for the border of the popup window is
'Comment', but 'Normal' seems to be a safer choice.

If you prefer the previous default, add this to your Vim configuration file:

  let g:fzf_layout = { 'down': '40%' }

(fzf will fall back to this if popup window is not supported)

Fix https://github.com/junegunn/fzf.vim/issues/1116

Fix the regular expression to capture the command containing asterisk.