highlightSearchWords() is not called after fragments are loaded via AJAX

[mitya57]

Describe the bug

When I build Sphinx' own documentation locally, and search for example, search results look like this:

Only if I go to browser console and call SphinxHighlight.highlightSearchWords(), it starts looking like this:

highlightSearchWords() is called on DOMContentLoaded event, but page fragments are loaded separately after that event.

How to Reproduce

$ git clone https://github.com/sphinx-doc/sphinx.git
$ cd sphinx
$ python3 ./sphinx/cmd/build.py -T doc build/html/
$ cd build/html
$ python3 -m http.server
$ # open http://127.0.0.1:8000/search.html?q=example

Expected behavior

Search terms are highlighted after all page fragments are loaded.

Your project

Sphinx itself

Screenshots

No response

OS

Linux

Python version

3.10.7

Sphinx version

5.2.0.post1 and master

Sphinx extensions

No response

Extra tools

No response

Additional context

No response