anchor.diff:  color header      color19     color21     "^(Subject)"
   
   # body
  -color normal      color19     color15
  -color underline   color19     color15
  -color bold        color19     color15
  +color normal      color0     color15
  +color underline   color0     color15
  +color bold        color0     color15
   color signature   color20     color15
   
   color quoted      color3      color15
  
positive.code: color indicator   color19     color7
  color tree        color7      color15                 # arrow in threads
  
  color index       color8      color15      "~A"       # all messages
  color index       color1      color15      "~F"       # flagged messages
  color index       color8      color15      "~v~(!~N)" # collapsed thread with no unread
  color index       color4      color15      "~U"       # unread messages
  color index       color4      color15      "~v~(~N)"  # collapsed thread with some unread
  color index       color1      color15      "~v~(~F)"  # collapsed thread with some flagged
  
negative.code: 
  # basic colors ---------------------------------------------------------
  #     name        foreground  background  pattern
  color normal      color0      color15
  color error       color1      color15
  color tilde       color0      color15
  color message     color0      color15
  color markers     color1      color15
  color attachment  color20     color15
  color search      color2      color15
  