return App.width(line.data:sub(soff, loff-1)), App.width(line.data:sub(soff, hoff))
  assert(State.cursor1.pos)
  if Text.cursor_at_final_screen_line(State) then
    -- line is done, skip to next text line
--?     print('cursor at final screen line of its line')
end

    log_browser.draw(Log_browser_state, --[[hide_cursor]] Focus ~= 'log_browser')
  end

          Text.draw(State, line_index, y, --[[startpos]] 1, hide_cursor)
          State.left,State.right = old_left,old_right
        else
          height = log_render[line.data.name](line.data, xleft, y, xright-xleft)
        end
      end
      if App.mouse_x() > Log_browser_state.left and line_index == mouse_line_index then
        App.color(Cursor_line_background_color)
        love.graphics.rectangle('fill', xleft,y, xright-xleft, height)
      end
      y = y + height
    end
  end
end
function render_stack_left_margin(State, line_index, line, y)
  if line.section_stack == nil then
    -- assertion message
    for k,v in pairs(line) do
      print(k)
    end
  end
  App.color(Section_border_color)
  for i=1,#line.section_stack do
    local x = State.left + (i-1)*Section_border_padding_horizontal
    love.graphics.line(x,y, x,y+log_browser.height(State, line_index))
    if y < 30 then
      love.graphics.print(line.section_stack[i].name, x+State.font_height+5, y+5, --[[vertically]] math.pi/2)
    end
    if y > App.screen.height-log_browser.height(State, line_index) then
function log_browser.draw(State, hide_cursor)
  assert(#State.lines == #State.line_cache)
  local mouse_line_index = log_browser.line_index(State, App.mouse_x(), App.mouse_y())
  local y = State.top
  for line_index = State.screen_top1.line,#State.lines do
    App.color(Text_color)
    local line = State.lines[line_index]
    if y + State.line_height > App.screen.height then break end
    local height = State.line_height
    if should_show(line) then
      local xleft = render_stack_left_margin(State, line_index, line, y)
      local xright = render_stack_right_margin(State, line_index, line, y)
      if line.section_name then
        App.color(Section_border_color)