[PATCH] Add support for 'thing-at-point' to get URL at point

[Jim Porter]

This is similar to Emacs bug#66752[1]. It would be nice if 
"(thing-at-point 'url)" would return the URL when point is over an Org 
link. With this, it's easier to write a function that copies (or browses 
to) the URL at point without coding so many special cases.

Attached is a patch with a regression test for it. Should this also get 
a NEWS entry?

[1] https://lists.gnu.org/archive/html/bug-gnu-emacs/2023-10/msg01628.html

0001-Add-support-for-thing-at-point-to-get-URL-at-point.patch
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