Ensure classes between > and < are properly extracted

[RobinMalfait]

This PR fixes an issue where candidates inside >…< were not always correctly extracted. This happens in XML-like languages where the classes are inside of these boundaries.

E.g.:

<!-- Fluid template language -->
<f:variable name="bgStyle">
  <f:switch expression="{data.layout}">
    <f:case value="0">from-blue-900 to-cyan-200</f:case>
    <!--              ^^^^^^^^^^^^^^^^^^^^^^^^^      -->
    <f:case value="1">from-cyan-600 to-teal-200</f:case>
    <f:defaultCase>from-blue-300 to-cyan-100</f:defaultCase>
  </f:switch>
</f:variable>

Fixes: #17088

Test plan

1. Added a new test
2. Existing tests pass