0.26.0

• Added support for fixed header in preview window

  # Display top 3 lines as the fixed header
  fzf --preview 'bat --style=full --color=always {}' --preview-window '~3'
  
  # Works well with the streaming preview
  fzf --preview-window 'follow:~2' --preview 'for i in $(seq 100000); do
    # Clear preview content every 300 lines and print header
    (( i % 300 == 1 )) && echo -e "\x1b[2J$i ~ $((i + 300))" && echo '---'
    echo "$i"
    sleep 0.01
  done'

• More advanced preview offset expression to better support the fixed header

  # Preview with bat, matching line in the middle of the window below
  # the fixed header of the top 3 lines
  #
  #   ~3    Top 3 lines as the fixed header
  #   +{2}  Base scroll offset extracted from the second field
  #   +3    Extra offset to compensate for the 3-line header
  #   /2    Put in the middle of the preview area
  #
  git grep --line-number '' |
    fzf --layout reverse --delimiter : \
        --preview 'bat --style=full --color=always --highlight-line {2} {1}' \
        --preview-window '~3:+{2}+3/2'

• Added select and deselect action for unconditionally selecting or
  deselecting a single item in --multi mode. Complements toggle action.
• Sigificant performance improvement in ANSI code processing
• Bug fixes and improvements
• Built with Go 1.16