function Drawing.mouse_release(State, x,y, mouse_button)
  if line_cache.starty == nil then
    -- some event cleared starty just this frame
    -- draw in this frame will soon set starty
    -- just skip this frame
    return
  end
  assert(drawing.mode == 'drawing')
  local pmx, pmy = App.mouse_x(), App.mouse_y()
  local mx = Drawing.coord(pmx-State.left, State.width)
  local my = Drawing.coord(pmy-line_cache.starty, State.width)
  if App.mouse_down(1) then
    if Drawing.in_drawing(drawing, line_cache, pmx,pmy, State.left,State.right) then
      if drawing.pending.mode == 'freehand' then
        table.insert(drawing.pending.points, {x=mx, y=my})
      elseif drawing.pending.mode == 'move' then
        drawing.pending.target_point.x = mx
        drawing.pending.target_point.y = my
        Drawing.relax_constraints(drawing, drawing.pending.target_point_index)
      end
    end
  elseif State.current_drawing_mode == 'move' then
    if Drawing.in_drawing(drawing, line_cache, pmx, pmy, State.left,State.right) then
      drawing.pending.target_point.x = mx
      drawing.pending.target_point.y = my
      Drawing.relax_constraints(drawing, drawing.pending.target_point_index)
    end
  else
    -- do nothing
  end
end
function Drawing.relax_constraints(drawing, p)
  for _,shape in ipairs(drawing.shapes) do
    if shape.mode == 'manhattan' then
      if shape.p1 == p then
        shape.mode = 'line'
      elseif shape.p2 == p then
        shape.mode = 'line'
      end
    elseif shape.mode == 'rectangle' or shape.mode == 'square' then
      for _,v in ipairs(shape.vertices) do
        if v == p then
          shape.mode = 'polygon'
        end
      end
    end
  end
end
function Drawing.mouse_press(State, drawing_index, x,y, mouse_button)
    love.graphics.circle('line', cx,cy, Drawing.pixels(r, width))
  elseif shape.mode == 'arc' then
    local center = drawing.points[shape.center]
    if mx < 0 or mx >= 256 or my < 0 or my >= drawing.h then
      return
    end
    shape.end_angle = geom.angle_with_hint(center.x,center.y, mx,my, shape.end_angle)
    local cx,cy = px(center.x), py(center.y)
    love.graphics.arc('line', 'open', cx,cy, Drawing.pixels(shape.radius, width), shape.start_angle, shape.end_angle, 360)
  elseif shape.mode == 'move' then
    -- nothing pending; changes are immediately committed
  elseif shape.mode == 'name' then
    -- nothing pending; changes are immediately committed
  else
    print(shape.mode)
    assert(false)
  end
end
function Drawing.in_drawing(drawing, line_cache, x,y, left,right)
  if line_cache.starty == nil then return false end  -- outside current page
  local width = right-left
  return y >= line_cache.starty and y < line_cache.starty + Drawing.pixels(drawing.h, width) and x >= left and x < right
end
    local r = round(geom.dist(center.x, center.y, mx, my))
    local cx,cy = px(center.x), py(center.y)

  if show_line_numbers then
    App.color(Line_number_color)
    love.graphics.print(line_index, State.left-Line_number_width*App.width('m')+10,y)
  end
  initialize_color()
function Text.draw(State, line_index, y, startpos, hide_cursor, show_line_numbers)
  local line = State.lines[line_index]
  local line_cache = State.line_cache[line_index]
  line_cache.starty = y
  line_cache.startpos = startpos

    edit.put_cursor_on_next_text_line(State)
    for i=1,math.floor(-dy) do
      Text.down(State)
    end
    edit.put_cursor_on_next_text_line(State)
    for i=1,math.floor(dy) do
      Text.up(State)
    end
  elseif dy < 0 then
    State.cursor1 = {line=State.screen_bottom1.line, pos=State.screen_bottom1.pos}
      y, screen_bottom1.pos = Text.draw(State, line_index, y, startpos, hide_cursor, show_line_numbers)
--?       print('=> y', y)
    elseif line.mode == 'drawing' then
      y = y+Drawing_padding_top
      Drawing.draw(State, line_index, y)
      y = y + Drawing.pixels(line.h, State.width) + Drawing_padding_bottom
    else
      print(line.mode)
      assert(false)
        local buttonx = State.left-Margin_left+4
        if show_line_numbers then
          buttonx = 4  -- HACK: position draw buttons at a fixed x on screen
        end
        button(State, 'draw', {x=buttonx, y=y+4, w=12,h=12, color={1,1,0},
          icon = icon.insert_drawing,
          onpress1 = function()
                       Drawing.before = snapshot(State, line_index-1, line_index)
                       table.insert(State.lines, line_index, {mode='drawing', y=y, h=256/2, points={}, shapes={}, pending={}})
                       table.insert(State.line_cache, line_index, {})
                       if State.cursor1.line >= line_index then
                         State.cursor1.line = State.cursor1.line+1
                       end
                       schedule_save(State)
                       record_undo_event(State, {before=Drawing.before, after=snapshot(State, line_index-1, line_index+1)})
                     end,
        })
function edit.draw(State, hide_cursor, show_line_numbers)
  State.button_handlers = {}
  App.color(Text_color)
function edit.put_cursor_on_next_text_line(State)
  while true do
  if State.cursor1.line >= #State.lines then
    break
  end
  if State.lines[State.cursor1.line].mode == 'text' then
    break
  end
  State.cursor1.line = State.cursor1.line+1
  State.cursor1.pos = 1
  end
end
    edit.put_cursor_on_next_text_line(State)
  end
end
function edit.invalid1(State, loc1)
    left = math.floor(left),  -- left margin for text; line numbers go to the left of this
    right = math.floor(right),

  edit.draw(Editor_state, --[[hide cursor?]] Show_file_navigator, --[[show line numbers]] true)
  if Show_log_browser_side then
    -- divider
    App.color(Divider_color)
    love.graphics.rectangle('fill', App.screen.width/2-1,Menu_status_bar_height, 3,App.screen.height)
    --
  love.window.setTitle('text.love - source - '..Editor_state.filename)

  source.switch_to_file(s..'.lua')
  love.window.setTitle('lines.love - source - '..Editor_state.filename)
  reset_file_navigator()
end
function move_candidate_to_front(s)
  local index = array.find(File_navigation.all_candidates, s)
  assert(index)
  table.remove(File_navigation.all_candidates, index)
  table.insert(File_navigation.all_candidates, 1, s)
end
function reset_file_navigator()
  Show_file_navigator = false
  File_navigation.index = 1
  File_navigation.filter = ''
  File_navigation.candidates = File_navigation.all_candidates
end

      App.screen.width - Test_margin_right,
Test_margin_right = 0
-- Insulate tests from some key globals so I don't have to change the vast
-- majority of tests when they're modified for the real app.
  if State.next_save and State.next_save < Current_time then
end
    State.search_backup = {
      cursor={line=State.cursor1.line, pos=State.cursor1.pos},
      screen_top={line=State.screen_top1.line, pos=State.screen_top1.pos},
    }