start thinking of compute_fragments as a detail

Dependencies

• [2] TXHMMX25 move caching behavior inside compute_fragments
• [3] KKMFQDR4 editing source code from within the app
• [4] H2DPLWMV snapshot: wrapping long lines at word boundaries
• [5] XUGDTYW2 stop confusingly reading a global
• [6] HVJKBW5U drop some unnecessary calls
• [7] ZDAJXYIX remove some unnecessary work
• [8] ILOA5BYF separate data structure for each line's cache data
• [9] H4R5BHVY no more Text allocations
• [10] S2QMLRXL stop creating a singleton table for every word
• [11] G54H3YG2 get rid of all bifold text
• [*] BULPIBEG beginnings of a module for the text editor

Change contents

• replacement in text.lua at line 15
  [4.47]→[2.3:47](∅→∅)
  − Text.compute_fragments(State, line_index)
  [4.47]

  [4.3860]
  + Text.populate_screen_line_starting_pos(State, line_index)
• replacement in source_text.lua at line 15
  [3.87349]→[3.87349:87393](∅→∅)
  − Text.compute_fragments(State, line_index)
  [3.87349]

  [3.87393]
  + Text.populate_screen_line_starting_pos(State, line_index)