1. Visit a bookdown-built book deployed to an HTTP server, such as: https://docs.rstudio.com/connect/admin/
2. Use the 'f' keyboard shortcut to open the search input dialog.
3. Type in a search phrase; try "markdown".
4. Observe that the left-hand TOC has narrowed to the chapters with matching content but shows all sub-sections - even those that do not match the term.

Search should narrow beyond chapter. Not narrowing makes it extremely difficult for book consumers to discover the occurrences of the term. They know that it is somewhere in the chapter but are not given additional guidance. This is complicated by the fact that users are unable to discover that up and down arrows can be used to navigate through results.

It's probably fine to not expand the sub-section tree and continue refining.

Here is a screenshot showing a number of "Files & Directories" sections included while filtering with search. Of these sections, "Variable Data" is the first that contains the "markdown" term.

This issue is lessened (not eliminated) by #254.

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