record one more case I can't automatically detect

Dependencies

• [2] PIEDOKYQ bugfix
• [*] BJ5X5O4A let's prevent the text cursor from ever getting on a drawing

Change contents

• edit in Manual_tests.md at line 18
  [2.424]
  +

  + * Some inputs get processed in love.textinput and some in love.keypressed.

  + Several bugs have arisen due to destructive interference between the two for

  + some key chord. I wish I could guarantee that the two sets are disjoint. But

  + perhaps I'm not thinking about this right.