make a function oblivious to line data structure

Dependencies

• [2] ODLKHO7B switch to line index in a function
• [3] UV4EWOLY add args to some functions
• [4] QCPXQ2E3 add state arg to a few functions
• [5] MXA3RZYK deduce left/right from state where possible
• [6] CPZGQT72 go through and fix similar issues
• [7] BOFNXP5G clicking now moves the cursor even on long, wrapped lines
• [8] MYC7XR5Q bugfix: lines that aren't drawn from the start
• [9] IWYLK45K clicking to the right of a line within line width
• [10] LF7BWEG4 group all editor globals
• [11] HYEAFRZ2 split mouse_pressed events between Text and Drawing
• [*] BULPIBEG beginnings of a module for the text editor

Change contents

• replacement in text.lua at line 702
  [2.481]→[3.3928:4056](∅→∅),[3.3040]→[3.3928:4056](∅→∅),[3.578]→[3.3928:4056](∅→∅)
  − return y < line.starty + State.line_height*(#line.screen_line_starting_pos - Text.screen_line_index(line, line.startpos) + 1)
  [2.481]

  [3.95]
  + return y < line.starty + State.line_height*(#line.screen_line_starting_pos - Text.screen_line_index(line.screen_line_starting_pos, line.startpos) + 1)
• replacement in text.lua at line 714
  [3.1306]→[3.1306:1384](∅→∅)
  − local start_screen_line_index = Text.screen_line_index(line, line.startpos)
  [3.1306]

  [3.1384]
  + local start_screen_line_index = Text.screen_line_index(line.screen_line_starting_pos, line.startpos)
• replacement in text.lua at line 752
  [3.1654]→[3.1654:1798](∅→∅)
  − function Text.screen_line_index(line, pos)

  − for i = #line.screen_line_starting_pos,1,-1 do

  − if line.screen_line_starting_pos[i] <= pos then
  [3.1654]

  [3.1798]
  + function Text.screen_line_index(screen_line_starting_pos, pos)

  + for i = #screen_line_starting_pos,1,-1 do

  + if screen_line_starting_pos[i] <= pos then