Fix #1766

The output may contain some unexpected warning messages from the shell
if it's not properly configured. While such extra messages should be
properly addressed by the user, we can ignore them by checking the
last line of the output instead of the first line.

Related: https://github.com/junegunn/fzf.vim/commit/bd3a021ec11617c56e6aa95578fee619445b029d

So that you can still build and use fzf even when the precise version
number is not injected via -ldflags.

Fix #2229

Related: https://github.com/junegunn/fzf.vim/issues/1150#issuecomment-717735149

So that the package maintainers would immediately know that the build is
incorrect. But is there a way to make build simply fail?

Related: https://github.com/junegunn/fzf.vim/issues/1150

* Fix: barbled multibyte text(exe. Japanese).

* fixup

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

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