Philip Kaludercic <philipk@posteo.net> writes:

> Tags: patch
>
>
> This command solves a long-standing annoyance I have had when working
> with diffs.  To my knowledge there is no existing way to achieve this
> (rectangular selection might be possible, but that behaves differently
> when the text is yanked).  The binding "w" seems intuitive when
> contrasted with "M-w", but might be confused with "W" (widen).  Not sure
> if that is an issue or not.
>
> In GNU Emacs 30.0.50 (build 8, x86_64-pc-linux-gnu, GTK+ Version
>  3.24.37, cairo version 1.16.0) of 2023-08-18 built on quetzal
> Repository revision: 2f74a459d2a82578fd9a92e9e2facdca90dad974
> Repository branch: feature/a-package-for-elpa
> System Description: Debian GNU/Linux 12 (bookworm)
>
> Configured using:
>  'configure --with-pgtk --with-native-compilation --with-imagemagick
>  --with-tree-sitter'

It seems I prepared to patch too hastily, and forgot to add a docstring.
Here is the updated version, with a docstring: