bug#71685: [PATCH] fix shr rendering in tables without tbody

[Eli Zaretskii]

> From: JD Smith <jdtsmith@gmail.com>
> Date: Thu, 20 Jun 2024 15:15:32 -0400
> 
> It is very common for HTML tables to include a header (<thead>) and/or footer 
> (<tfoot>) without using <tbody>.  Modern browsers simply supply an implicit 
> <tbody>..</tbody> around all the unparented rows in a table.  `shr' does not 
> handle this common case correctly.  Below is an example with <thead> but not 
> <tbody>.  It prints the header, but then subsumes it again inside the derived 
> body, printing the header again in a single cell.  
> 
> The relevant function which should handle this is `shr--fix-tbody'.   The 
> included patch to this function simply avoids including `thead` and `tfoot` 
> children in the implicit body.

Thanks.  I don't see any experts chiming in, so if you are confident
in the patch, and it doesn't fail the existing tests, please install
on the emacs-30 branch, and thanks.  Bonus points for adding a test
for this case.