Diff syntax highlighting is broken
+aaa
+bbb
ccc
results into this (formatted for legibility)
<pre class="code highlight">
<code>
<span id="LC1" class="line">
<span class="gi">+aaa</span>
<span id="LC2" class="line">+bbb</span>
<span id="LC3" class="line"></span>
ccc
</span>
</code>
</pre>
See https://gitlab.com/jtojnar/test/blob/master/test.diff and https://gitlab.com/snippets/7316
It is probably caused by intersection of the span tags of highligter and lines.