reconcile manual tests with some downstream forks

Dependencies

• [2] SW7BSBMJ several bugfixes in saving/loading cursor position
• [3] FP5NTKWA .
• [4] KKMFQDR4 editing source code from within the app
• [5] EWJZ6XHB better formatting
• [*] BJ5X5O4A let's prevent the text cursor from ever getting on a drawing

Change contents

• replacement in Manual_tests.md at line 7
  [3.82]→[3.82:151](∅→∅)
  − - delete app settings, start; window opens running the text editor
  [3.210630]

  [2.804]
  + - delete app settings, start with a filename; window opens running the text editor with cursor at top of file

  + - run with absolute file path; quit; restart; window opens running the text editor in same position+dimensions

  + - run with relative file path; quit; switch to new directory; restart without a filename; window opens running the text editor in same file in same position+dimensions