stop saving the entire file when modifying drawings

Dependencies

• [2] 7SFHSB47 rename
• [3] 2ENZW7TV select text using mouse drag
• [4] NQKFQSZE undo creating new drawings
• [5] LUNH47XX make text and drawings the same width
• [6] VHQCNMAR several more modules
• [7] WTDKUACN rectangle and square shapes
• [8] DLQMM265 scroll past first page
• [9] 73OCE2MC after much struggle, a brute-force undo
• [10] SQLVYKVJ rename
• [11] VJ77YABH more efficient undo/redo
• [12] U2TKUOID bugfix: undo drawing creation
• [13] HYEAFRZ2 split mouse_pressed events between Text and Drawing
• [14] 6DE7RBZ6 move mouse_released events to Drawing
• [*] OTIBCAUJ love2d scaffold
• [*] BLWAYPKV extract a module

Change contents

• replacement in undo.lua at line 39
  [4.122]→[4.122:202](∅→∅)
  − if s == nil and e == nil then

  − s = 1

  − e = #Lines

  − elseif e == nil then
  [4.122]

  [4.202]
  + assert(s)

  + if e == nil then
• edit in main.lua at line 293
  [4.584]

  [4.584]
  + Lines.current_drawing_index = line_index

  + Lines.current_drawing = line

  + Drawing.before = snapshot(line_index)
• edit in main.lua at line 306
  [3.365]

  [3.365]
  + save_to_disk(Lines, Filename)

  + if Drawing.before then

  + record_undo_event({before=Drawing.before, after=snapshot(Lines.current_drawing_index)})

  + Drawing.before = nil

  + end
• edit in drawing.lua at line 209
  [4.853]→[4.646:676](∅→∅)
  − Drawing.before = snapshot()
• edit in drawing.lua at line 228
  [4.1677]→[2.100:134](∅→∅)
  − Lines.current_drawing = drawing
• edit in drawing.lua at line 349
  [4.3127]→[4.3127:3159](∅→∅),[4.3159]→[4.75:100](∅→∅),[4.100]→[4.677:742](∅→∅),[4.742]→[4.176:207](∅→∅),[4.176]→[4.176:207](∅→∅)
  − save_to_disk(Lines, Filename)

  − if Drawing.before then

  − record_undo_event({before=Drawing.before, after=snapshot()})

  − Drawing.before = nil

  − end