HighlightTrailingWhitespace

-- Highlight trailing whitespace
local tw_indicator = _SCINTILLA.next_indic_number()
buffer.indic_style[tw_indicator] = buffer.INDIC_ROUNDBOX
buffer.indic_fore[tw_indicator] = 0x0000FF
events.connect(events.UPDATE_UI, function(updated)
  if updated ~= buffer.UPDATE_CONTENT then return end
  buffer.target_start = 1
  buffer.search_flags = buffer.FIND_REGEXP
  buffer.indicator_current = tw_indicator
  buffer:indicator_clear_range(1, buffer.length)
  while true do
    buffer.target_end = buffer.length
    if buffer:search_in_target('[ \t]+$') == -1 then break end
    buffer:indicator_fill_range(
      buffer.target_start, buffer.target_end - buffer.target_start)
    buffer.target_start = buffer.target_end
  end
end)