extract scrolling logic out of insert_return

Dependencies

• [2] BTKAW76L rename
• [3] DHI6IJCN selecting text and deleting selections
• [4] GN3IF4WF bugfix: pasting newlines
• [5] AMSESRTH move some code
• [6] HOSPP2AN crisp font rendering
• [7] KOYAJWE4 extract a couple more methods
• [8] JJ7J4PUB some unnecessary mutations
• [*] BULPIBEG beginnings of a module for the text editor
• [*] 2ZYV7D3W handle tab characters
• [*] OTIBCAUJ love2d scaffold
• [*] LS55YKGW switch copy/paste to ctrl- hotkeys

Change contents

• edit in text.lua at line 182
  [3.27]

  [11.100]
  + if (Cursor_y + Line_height) > App.screen.height then

  + Text.snap_cursor_to_bottom_of_screen()

  + end
• edit in text.lua at line 378
  [3.405]→[3.3397:3464](∅→∅)
  − local scroll_down = (Cursor_y + Line_height) > App.screen.height
• edit in text.lua at line 382
  [3.652]→[3.652:674](∅→∅),[3.674]→[2.3:46](∅→∅),[2.46]→[3.40:46](∅→∅),[3.754]→[3.40:46](∅→∅),[3.40]→[3.40:46](∅→∅)
  − if scroll_down then

  − Text.snap_cursor_to_bottom_of_screen()

  − end
• edit in main.lua at line 423
  [13.753]

  [13.753]
  + if (Cursor_y + Line_height) > App.screen.height then

  + Text.snap_cursor_to_bottom_of_screen()

  + end