bug#59539: 29.0.50; Commands created with `insert-kbd-macro` are NOT getting repeated.

[Juri Linkov]

>> Do you have an idea how to do the right thing and to guess the user's
>> intention without checking if there are the same keys in the keymap?
>
> I guess it should be possible to find out what the 'original' key
> pressed was. <time passes> How about the below? I guess it changes the
> behaviour when you have a command bound to two keys in the same repeat
> map, and you use the 'wrong' one to repeat

I tested your patch, but then 'C-_' starts the key sequence
'C-_ u u u', whereas we had the users' requests that only 'C-x u'
should start the repeatable sequence by default with 'C-x u u u'.

> (but I could argue that people creating such keymaps should use the
> 'repeat-check-key' property)

For more fine-grained control than 'repeat-check-key', we could support
more properties, for example, define separately only keys that enter
the repeatable sequence, or keys that exit it:

  (put 'undo 'repeat-enter-keys '([?\C-x ?u]))
  (put 'undo 'repeat-exit-keys '([?\C-_]))