bug#58712: Incorrect vtable edges recognizing

[Stefan Kangas]

Lämppi Lütti <lamppilutti@protonmail.com> writes:

> Functions `vtable-beginning-of-table' and `vtable-beginning-of-table' 
> recognize
> edges incorrectly. Because of this `vtable-narrow-current-column',
> `vtable-widen-current-column', `vtable-sort-by-current-column' and
> `vtable-header-line-sort' remove all text before and after the table.
>
> There is small patch to fix this.

Do you have a recipe to reproduce this issue?  That would make it easier
to test the patch.  Thanks in advance.