another piece of support for line wrapping in cursor up

Dependencies

• [2] MGT5FTJ3 first stab at supporting wrapping in cursor up
• [3] XNFTJHC4 split keyboard handling between Text and Drawing
• [*] BULPIBEG beginnings of a module for the text editor
• [*] BJ5X5O4A let's prevent the text cursor from ever getting on a drawing

Change contents

• replacement in text.lua at line 230
  [2.477]→[2.477:556](∅→∅)
  − Cursor_pos = Text.nearest_cursor_pos(Lines[Cursor_line].data, old_x)
  [2.477]

  [2.556]
  + if Lines[Cursor_line].screen_line_starting_pos == nil then

  + Cursor_pos = Text.nearest_cursor_pos(Lines[Cursor_line].data, old_x)

  + break

  + end

  + local screen_line_starting_pos = Lines[Cursor_line].screen_line_starting_pos

  + screen_line_starting_pos = screen_line_starting_pos[#screen_line_starting_pos]

  + Top_screen_line_starting_pos = screen_line_starting_pos

  + local s = string.sub(Lines[Cursor_line].data, screen_line_starting_pos)

  + Cursor_pos = screen_line_starting_pos + Text.nearest_cursor_pos(s, old_x) - 1
• edit in manual_tests at line 26
  [2.1511]

  [2.1511]
  + if previous line (above top of screen) wrapped, it scrolls up by only one screen line