function Drawing.mouse_released(State, x,y, mouse_button)
  if State.current_drawing_mode == 'move' then
    State.current_drawing_mode = State.previous_drawing_mode
    State.previous_drawing_mode = nil
    if State.lines.current_drawing then
      State.lines.current_drawing.pending = {}
      State.lines.current_drawing = nil
function Drawing.mouse_pressed(State, drawing_index, x,y, mouse_button)
  local drawing = State.lines[drawing_index]
  local line_cache = State.line_cache[drawing_index]

function icon.insert_drawing(button_params)
  local x,y = button_params.x, button_params.y
  App.color(Icon_color)

        button(State, 'draw', {x=4,y=y+4, w=12,h=12, color={1,1,0},