Log message:
fzf: update to 0.23.1

CHANGELOG
=========

0.23.1
------
- Added `--preview-window` options for disabling flags
    - `nocycle`
    - `nohidden`
    - `nowrap`
    - `default`
- Built with Go 1.14.9 due to performance regression
    - https://github.com/golang/go/issues/40727

0.23.0
------
- Support preview scroll offset relative to window height
  ```sh
  git grep --line-number '' |
    fzf --delimiter : \
        --preview 'bat --style=numbers --color=always --highlight-line {2} {1}' \
        --preview-window +{2}-/2
  ```
- Added `--preview-window` option for sharp edges (`--preview-window sharp`)
- Added `--preview-window` option for cyclic scrolling (`--preview-window cycle`)
- Reduced vertical padding around the preview window when `--preview-window
  noborder` is used
- Added actions for preview window
    - `preview-half-page-up`
    - `preview-half-page-down`
- Vim
    - Popup width and height can be given in absolute integer values
    - Added `fzf#exec()` function for getting the path of fzf executable
        - It also downloads the latest binary if it's not available by running
          `./install --bin`
- Built with Go 1.15.2
    - We no longer provide 32-bit binaries

0.22.0
------
- Added more options for `--bind`
    - `backward-eof` event
      ```sh
      # Aborts when you delete backward when the query prompt is already empty
      fzf --bind backward-eof:abort
      ```
    - `refresh-preview` action
      ```sh
      # Rerun preview command when you hit '?'
      fzf --preview 'echo $RANDOM' --bind '?:refresh-preview'
      ```
    - `preview` action
      ```sh
      # Default preview command with an extra preview binding
      fzf --preview 'file {}' --bind '?:preview:cat {}'

      # A preview binding with no default preview command
      # (Preview window is initially empty)
      fzf --bind '?:preview:cat {}'

      # Preview window hidden by default, it appears when you first hit '?'
      fzf --bind '?:preview:cat {}' --preview-window hidden
      ```
- Added preview window option for setting the initial scroll offset
  ```sh
  # Initial scroll offset is set to the line number of each line of
  # git grep output *minus* 5 lines
  git grep --line-number '' |
    fzf --delimiter : --preview 'nl {1}' --preview-window +{2}-5
  ```
- Added support for ANSI colors in `--prompt` string
- Smart match of accented characters
    - An unaccented character in the query string will match both accented and
      unaccented characters, while an accented character will only match
      accented characters. This is similar to how "smart-case" match works.
- Vim plugin
    - `tmux` layout option for using fzf-tmux
      ```vim
      let g:fzf_layout = { 'tmux': '-p90%,60%' }
      ```

0.21.1
------
- Shell extension
    - CTRL-R will remove duplicate commands
- fzf-tmux
    - Supports tmux popup window (require tmux 3.2 or above)
        - ```sh
          # 50% width and height
          fzf-tmux -p

          # 80% width and height
          fzf-tmux -p 80%

          # 80% width and 40% height
          fzf-tmux -p 80%,40%
          fzf-tmux -w 80% -h 40%

          # Window position
          fzf-tmux -w 80% -h 40% -x 0 -y 0
          fzf-tmux -w 80% -h 40% -y 1000

          # Write ordinary fzf options after --
          fzf-tmux -p -- --reverse --info=inline --margin 2,4 --border
          ```
        - On macOS, you can build the latest tmux from the source with
          `brew install tmux --HEAD`
- Bug fixes
    - Fixed Windows file traversal not to include directories
    - Fixed ANSI colors with `--keep-right`
    - Fixed _fzf_complete for zsh
- Built with Go 1.14.1

0.21.0
------
- `--height` option is now available on Windows as well (@kelleyma49)
- Added `--pointer` and `--marker` options
- Added `--keep-right` option that keeps the right end of the line visible
  when it's too long
- Style changes
    - `--border` will now print border with rounded corners around the
      finder instead of printing horizontal lines above and below it.
      The previous style is available via `--border=horizontal`
    - Unicode spinner
- More keys and actions for `--bind`
- Added PowerShell script for downloading Windows binary
- Vim plugin: Built-in floating windows support
  ```vim
  let g:fzf_layout = { 'window': { 'width': 0.9, 'height': 0.6 } }
  ```
- bash: Various improvements in key bindings (CTRL-T, CTRL-R, ALT-C)
    - CTRL-R will start with the current command-line as the initial query
    - CTRL-R properly supports multi-line commands
- Fuzzy completion API changed
  ```sh
  # Previous: fzf arguments given as a single string argument
  # - This style is still supported, but it's deprecated
  _fzf_complete "--multi --reverse --prompt=\"doge> \"" \ 
"$@" < <(
    echo foo
  )

  # New API: multiple fzf arguments before "--"
  # - Easier to write multiple options
  _fzf_complete --multi --reverse --prompt="doge> " -- \ 
"$@" < <(
    echo foo
  )
  ```
- Bug fixes and improvements

0.20.0
------
- Customizable preview window color (`preview-fg` and `preview-bg` for `--color`)
  ```sh
  fzf --preview 'cat {}' \
      --color 'fg:#bbccdd,fg+:#ddeeff,bg:#334455,preview-bg:#223344,border:#778899' \
      --border --height 20 --layout reverse --info inline
  ```
- Removed the immediate flicking of the screen on `reload` action.
  ```sh
  : | fzf --bind 'change:reload:seq {q}' --phony
  ```
- Added `clear-query` and `clear-selection` actions for `--bind`
- It is now possible to split a composite bind action over multiple `--bind`
  expressions by prefixing the later ones with `+`.
  ```sh
  fzf --bind 'ctrl-a:up+up'

  # Can be now written as
  fzf --bind 'ctrl-a:up' --bind 'ctrl-a:+up'

  # This is useful when you need to write special execute/reload form (i.e. \ 
`execute:...`)
  # to avoid parse errors and add more actions to the same key
  fzf --multi --bind 'ctrl-l:select-all+execute:less {+f}' --bind \ 
'ctrl-l:+deselect-all'
  ```
- Fixed parse error of `--bind` expression where concatenated execute/reload
  action contains `+` character.
  ```sh
  fzf --multi --bind 'ctrl-l:select-all+execute(less {+f})+deselect-all'
  ```
- Fixed bugs of reload action
    - Not triggered when there's no match even when the command doesn't have
      any placeholder expressions
    - Screen not properly cleared when `--header-lines` not filled on reload

0.19.0
------

- Added `--phony` option which completely disables search functionality.
  Useful when you want to use fzf only as a selector interface. See below.
- Added "reload" action for dynamically updating the input list without
  restarting fzf. See https://github.com/junegunn/fzf/issues/1750 to learn
  more about it.
  ```sh
  # Using fzf as the selector interface for ripgrep
  RG_PREFIX="rg --column --line-number --no-heading --color=always \ 
--smart-case "
  INITIAL_QUERY="foo"
  FZF_DEFAULT_COMMAND="$RG_PREFIX '$INITIAL_QUERY' || true" \
    fzf --bind "change:reload:$RG_PREFIX {q} || true" \
        --ansi --phony --query "$INITIAL_QUERY"
  ```
- `--multi` now takes an optional integer argument which indicates the maximum
  number of items that can be selected
  ```sh
  seq 100 | fzf --multi 3 --reverse --height 50%
  ```
- If a placeholder expression for `--preview` and `execute` action (and the
  new `reload` action) contains `f` flag, it is replaced to the
  path of a temporary file that holds the evaluated list. This is useful
  when you multi-select a large number of items and the length of the
  evaluated string may exceed [`ARG_MAX`][argmax].
  ```sh
  # Press CTRL-A to select 100K items and see the sum of all the numbers
  seq 100000 | fzf --multi --bind ctrl-a:select-all \
                   --preview "awk '{sum+=\$1} END {print sum}' {+f}"
  ```
- `deselect-all` no longer deselects unmatched items. It is now consistent
  with `select-all` and `toggle-all` in that it only affects matched items.
- Due to the limitation of bash, fuzzy completion is enabled by default for
  a fixed set of commands. A helper function for easily setting up fuzzy
  completion for any command is now provided.
  ```sh
  # usage: _fzf_setup_completion path|dir COMMANDS...
  _fzf_setup_completion path git kubectl
  ```
- Info line style can be changed by `--info=STYLE`
    - `--info=default`
    - `--info=inline` (same as old `--inline-info`)
    - `--info=hidden`
- Preview window border can be disabled by adding `noborder` to
  `--preview-window`.
- When you transform the input with `--with-nth`, the trailing white spaces
  are removed.
- `ctrl-\`, `ctrl-]`, `ctrl-^`, and `ctrl-/` can now be used with `--bind`
- See https://github.com/junegunn/fzf/milestone/15?closed=1 for more details

[argmax]: \ 
https://unix.stackexchange.com/questions/120642/what-defines-the-maximum-size-for-a-command-single-argument

Log message:
Revbump all Go packages after default Go version was changed to 1.15.1

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Revbump all Go packages after default version switch to 1.14.

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