stop repeatedly checking for line wrapping

Dependencies

• [2] P66MRF3U bugfix: don't append metadata when it already exists
• [3] CVSRHMJ2 experiment: slightly adaptive scrolling
• [4] YLKLDF4R .
• [5] OGUV4HSA remove some memory leaks from rendered fragments
• [6] HOSPP2AN crisp font rendering
• [7] R53OF3ON one bug I've repeatedly run into while testing with Moby Dick
• [*] BULPIBEG beginnings of a module for the text editor
• [*] KOYAJWE4 extract a couple more methods
• [*] ZPUQSPQP extract a few methods

Change contents

• edit in text.lua at line 391
  [10.74]

  [10.74]
  + print('pageup')
• edit in text.lua at line 411
  [10.857]

  [11.83]
  + print('pageup end')
• edit in text.lua at line 415
  [10.883]

  [3.2828]
  + print('pagedown')
• edit in text.lua at line 436
  [5.184]

  [10.1214]
  + print('pagedown end')
• edit in text.lua at line 887
  [5.2366]

  [5.2366]
  + line.screen_line_starting_pos = {1}
• replacement in text.lua at line 897
  [5.2640]→[5.2640:2751](∅→∅),[5.2751]→[2.169:235](∅→∅),[2.235]→[5.2751:2818](∅→∅),[5.2751]→[5.2751:2818](∅→∅)
  − if line.screen_line_starting_pos == nil then

  − line.screen_line_starting_pos = {1, pos}

  − else

  − --? print(' ', #line.screen_line_starting_pos, line.data)

  − table.insert(line.screen_line_starting_pos, pos)

  − end
  [5.2640]

  [5.2818]
  + --? print(' ', #line.screen_line_starting_pos, line.data)

  + table.insert(line.screen_line_starting_pos, pos)
• replacement in text.lua at line 907
  [5.4025]→[4.3:37](∅→∅)
  − --? print('clearing fragments')
  [5.4025]

  [5.4025]
  + print('clearing fragments')