-- press and hold on first location
  App.run_after_mousepress(screen_left_margin+8,Margin_top+5, '1')
  -- drag and release somewhere else
  App.run_after_mouserelease(screen_left_margin+20,Margin_top+Line_height+5, '1')
  check_eq(Cursor1.line, 2, 'F - test_select_text_using_mouse/cursor:line')
  check_eq(Cursor1.pos, 4, 'F - test_select_text_using_mouse/cursor:pos')
  check_eq(Selection1.line, 1, 'F - test_select_text_using_mouse/selection:line')
  check_eq(Selection1.pos, 2, 'F - test_select_text_using_mouse/selection:pos')
end
function test_select_text_using_mouse_and_shift()
  io.write('\ntest_select_text_using_mouse_and_shift')
  App.screen.init{width=50, height=60}
  Lines = load_array{'abc', 'def', 'xyz'}
  Line_width = App.screen.width
  Cursor1 = {line=1, pos=1}
  Screen_top1 = {line=1, pos=1}
  Screen_bottom1 = {}
  Selection1 = {}
  App.draw()  -- populate line.y for each line in Lines
  local screen_left_margin = 25  -- pixels