if screen_line_index < #line.screen_line_starting_pos and mx > Text.screen_line_width(line, screen_line_index) then

      if screen_line_index < #line.screen_line_starting_pos and mx > Text.screen_line_width(State, line_index, screen_line_index) then

function Text.screen_line_width(line, i)

function Text.screen_line_width(State, line_index, i)
  local line = State.lines[line_index]