allow Text.nearest_pos_less_than to return 0

Dependencies

• [2] UPCIYZEU drop an unnecessary level of indent
• [3] HGC5RGJP switch to line index in a function
• [4] GL4Q5WCV keep text from overflowing right margin
• [5] BULPIBEG beginnings of a module for the text editor
• [6] ULKLJBN6 couple of renames
• [7] KURLAXXI clean up some prints
• [8] LF7BWEG4 group all editor globals
• [9] IMEJA43L snapshot
• [10] PFT5Y2ZY move
• [11] CVSRHMJ2 experiment: slightly adaptive scrolling
• [12] 356GY7IQ unify two similar functions
• [13] LXTTOB33 extract a couple of files

Change contents

• replacement in text_tests.lua at line 1047
  [3.26875]→[3.2596:2701](∅→∅),[3.2596]→[3.2596:2701](∅→∅)
  − App.screen.check(y, 'jkl m', 'F - test_pagedown_can_start_from_middle_of_long_wrapping_line/screen:2')
  [3.26875]

  [3.26876]
  + App.screen.check(y, 'jkl ', 'F - test_pagedown_can_start_from_middle_of_long_wrapping_line/screen:2')
• replacement in text_tests.lua at line 1049
  [3.26911]→[3.2723:2826](∅→∅),[3.2723]→[3.2723:2826](∅→∅)
  − App.screen.check(y, 'no ', 'F - test_pagedown_can_start_from_middle_of_long_wrapping_line/screen:3')
  [3.26911]

  [3.10090]
  + App.screen.check(y, 'mno ', 'F - test_pagedown_can_start_from_middle_of_long_wrapping_line/screen:3')
• replacement in text.lua at line 107
  [2.434]→[2.434:509](∅→∅)
  − assert(bpos > 0) -- avoid infinite loop when window is too narrow
  [2.434]

  [2.509]
  + if bpos == 0 then break end -- avoid infinite loop when window is too narrow
• edit in text.lua at line 803
  [3.672]→[3.7235:7271](∅→∅),[3.3518]→[3.7235:7271](∅→∅),[3.7235]→[3.7235:7271](∅→∅)
  − if x == 0 then

  − return 1

  − end
• replacement in text.lua at line 808
  [3.7387]→[3.7387:7418](∅→∅)
  − local left, right = 1, len+1
  [3.7387]

  [3.7436]
  + local left, right = 0, len+1