redo y computations

Dependencies

• [2] WKTPVZKL ensure integer coordinates
• [3] YJGADSGK delete unused arg
• [4] B3IWYWSR delete another arg that can be deduced
• [5] 7IKRRESB longer names for indices in long loops
• [6] OTIBCAUJ love2d scaffold
• [7] XX7G2FFJ intermingle freehand line drawings with text
• [8] 4NDYV4WD fix 2 bugs in line selection
• [9] QU7NHFOV show cursor
• [10] DLQMM265 scroll past first page
• [11] Y6FTGOHJ simpler
• [12] HJ3PM2VT .
• [13] EDY3RQUL gracefully handle a non-existent filename at the commandline
• [14] MGOQ5XAV start uppercasing globals

Change contents

• replacement in main.lua at line 109
  [5.67]→[5.44:58](∅→∅),[5.545]→[5.44:58](∅→∅),[5.15]→[5.44:58](∅→∅)
  − local y = 0
  [5.545]

  [5.2]
  + local y = 15
• edit in main.lua at line 113
  [5.588]→[2.3:35](∅→∅)
  − y = math.floor(y+15*Zoom)
• edit in main.lua at line 114
  [5.688]→[5.688:705](∅→∅)
  − line.y = y
• edit in main.lua at line 115
  [5.759]

  [5.759]
  + line.y = y
• edit in main.lua at line 128
  [5.1391]

  [5.1391]
  + y = math.floor(y+15*Zoom) -- text height
• replacement in main.lua at line 130
  [5.1432]→[5.1432:1469](∅→∅)
  − y = y+Drawing.pixels(line.h)
  [5.1432]

  [3.3]
  + y = y+10 -- padding

  + line.y = y
• edit in main.lua at line 133
  [3.30]

  [5.1499]
  + y = y + Drawing.pixels(line.h) + 10 -- padding
• edit in main.lua at line 135
  [5.1510]

  [4.267]
  + line.y = y
• edit in main.lua at line 137
  [4.328]

  [5.1574]
  + y = math.floor(y+15*Zoom) -- text height