When converting text like 

Some text <strong>Hello</strong> <em>World</em>!

from Moodle auto-format to HTML, whitespaces between HTML tags are removed, even if the tags are not block-level elements.

Observed behavior
The text is converted to

<div class="text_to_html">Some text <strong>Hello</strong><em>World</em>!</div>

Expected behavior
The text should be converted to

<div class="text_to_html">Some text <strong>Hello</strong> <em>World</em>!</div>

Further information
The issue is caused by the following code in the function text_to_html in the file lib/weblib.php (see GitHub). Introducing commit: https://github.com/moodle/moodle/commit/729be1ab37a2eb35cbda4a3ca8be2bf70bdfd3c1