Section summaries and titles are not greyed-out when sections are hidden. This confuses users, who are not sure whether the text is actually hidden, unless they change role to student to check.
Steps to reproduce
1. In a new course, edit any section summary, giving it a custom title and some summary text.
2. Add a resource to the section.
3. Click the 'hide' button on the right of the section.
Everything in the section should go grey to indicate that it is hidden from students.
The resource goes grey, but the section title and summary do not.