0. HOME=/tmp/${USER} emacs -Q  (start Emacs in a clean environment)
1. Type `M-x todo-show' and at the prompt type "test RET test RET test
   RET" to initialize the Todo file "test" with the category "test"
   containing the item "test".  The current buffer displays that
   category in todo-mode.
2. (Sanity check) In the current buffer with point on the item type `e'
   to begin an item editing command; the echo area now displays the
   prompt "Press a key (so far ‘e’): e=>edit h=>header m=>multiline
   y=>diary k=>nonmarking d=>date t=>time".  Type `C-g' to cancel the
   command.
3. Now type `i i' and at the prompt "test2 RET RET" to create the item
   "test2" with priority 1.
4. Now (immediately after step 3, without typing any key in between)
   type `e' to begin an item editing command for item "test2":
=> The echo area displays the message "‘e’ is not a valid remaining item
   insertion key".  Typing `e' again now displays the item editing
   prompt.

The bug in step 4 (`e' at first not being recognized as a valid Todo
mode command key) is due to commit 7f80070232, which provided a fix for
bug#70937.  It turns out this fix was incomplete; the following patch
fills in the gap: