Keyboard protocol spec: clarify associated text about kitty HOT 4 CLOSED

I should say: my assumption is that control characters shouldn't be considered as text (backspace, tab, enter as very obvious examples). Maybe that isn't correct. I don't care either way, just want clarity :)

from kitty.

If you have some concerns with my fix, feel free to say so.

from kitty.

Should the associated text be also reported if I have a text outside the said range, but I have e.g. Alt+Shift+something pressed? I know that some users don't expect associated text when you have non-empty modifiers with the exception of shift.

from kitty.

As long as the text has no control codes in it, it should be reported.
For example on macOS Alt (option) is used to generate accented chars,
they must be reported. Many systems have some kind of modifiers used as
part of "compose key" based input.

from kitty.