fix 2 bugs in line selection

Dependencies

• [2] G77XIN7M selecting a stroke
• [3] NZ7V4BVS note card
• [4] XX7G2FFJ intermingle freehand line drawings with text
• [5] EFMLTMZG bugfix: restrict strokes to the drawing they started in
• [6] QU7NHFOV show cursor
• [7] OTIBCAUJ love2d scaffold

Change contents

• replacement in main.lua at line 24
  [3.15]→[3.336:370](∅→∅),[3.58]→[3.336:370](∅→∅),[3.336]→[3.336:370](∅→∅)
  − for i, line in ipairs(lines) do
  [3.58]

  [3.59]
  + for i,line in ipairs(lines) do
• edit in main.lua at line 125
  [2.704]

  [2.704]
  + if math.abs(shape.x1-x) > 5 then

  + return false

  + end
• replacement in main.lua at line 130
  [2.760]→[2.760:780](∅→∅)
  − y1,y2 = y2,y2
  [2.760]

  [2.780]
  + y1,y2 = y2,y1