bug#43866: 26.3; italian postfix additions

[Eli Zaretskii]

> From: Robert Pluim <rpluim@gmail.com>
> Cc: Eli Zaretskii <eliz@gnu.org>,  43866@debbugs.gnu.org
> Date: Wed, 21 Oct 2020 10:11:55 +0200
> 
> Canʼt you pass a string containing ?y and ?́ as the last argument to
> define-key? (although you might want to use the ?\N{NAME} or ?\uXXXX
> syntax to stop Emacs combining that U+0301 with the question mark)

The character composition happens only on display, the buffer or
string still have two codepoints.