bug#43510: 28.0.50; shr inserts too much space between paragraphs

[Lars Ingebrigtsen]

With the following test file:

<p>Foo.</p><div id="zot"></div><p>Bar.</p>

M-x eww-open-file RET foo.html RET

You'll get:

This is due to the changes that were made earlier this year to put
placeholder data into the buffer when we have an element with an id that
is empty.


In GNU Emacs 28.0.50 (build 134, x86_64-pc-linux-gnu, GTK+ Version 3.24.22, 
cairo version 1.16.0)
 of 2020-09-18 built on xo
Repository revision: 3b79ff617918adcc775fce392504da1fb4b2030a
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Debian GNU/Linux bullseye/sid

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(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no