bug#70139: 29.3.50; key-translate does not support all keyboard-translate usages

[Charalampos Mitrodimas]

On 4/2/24 12:50, Robert Pluim wrote:
> When `key-translate' was added, it didnʼt cover all the cases that
> `keyboard-translate' does.
>
> Add a translation:
>
>      (keyboard-translate ?\C-a ?\C-z)
>
> Two ways to remove, of which I submit the first is 'obvious':
>
>      (keyboard-translate ?\C-a nil)
>      (keyboard-translate ?\C-a ?\C-a)
>
> Add:
>
>      (key-translate "C-a" "C-z")
>
> This works for removing a translation but is non-obvious:
>
>      (key-translate "C-a" "C-a")
>
> But this doesnʼt:
>
>      (key-translate "C-a" nil)
>
> =>
> Debugger entered--Lisp error: (error "nil is not a valid key definition; see 
> ‘key-valid-...")
>    signal(error ("nil is not a valid key definition; see ‘key-valid-..."))
>    error("%S is not a valid key definition; see `key-valid-p..." nil)
>
> Iʼm not sure this is worth fixing, but perhaps documenting that
> re-adding the same translation is (almost) the same as removing it?
>
> Thanks
>
> Robert
>
> In GNU Emacs 29.3.50 (build 2, x86_64-pc-linux-gnu, GTK+ Version
>   3.24.38, cairo version 1.16.0) of 2024-04-02 built on rltb
> Repository revision: 6b8b0a12333afeadb32744ba481679b05b758ed2
> Repository branch: emacs-29
> Windowing system distributor 'The X.Org Foundation', version 11.0.12009000
> System Description: Debian GNU/Linux 12 (bookworm)
>
> Configured features:
> ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
> JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY
> INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
> TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB

I accidentally sent the patch the wrong way (newcomer here), attaching here.

--
Charalampos Mitrodimas

0001-Improve-key-translate-to-support-removing-translatio.patch
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