Keep folders displayed when running an unified-search

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Is your feature request related to a problem? Please describe.
NC 23 implements this new cool feature that when you search for something in the unified-search, it will also filter the current files list.

However, if you search for something you cannot browse your folder hierarchy to find files matching your unified-search input: If the file you are looking for is not in the current folder, you have to reset the unified-search, open another subfolder you want to explore, and launch a new unified-search. This, until you find the good folder where the file you're looking for lives.

Describe the solution you'd like
When filtering the files list, it might be better to continue display folders so that the user can more easily drill-down in the folder hierarchy to find the file she's looking for.

Describe alternatives you've considered
I've developped an app to improve searching for files: https://framagit.org/StCyr/files_advancedsearch

Start by tracing the unified-search filtering of the current files list in the Nextcloud server repository. The change is complete when folders remain visible during filtering and users can drill down through the folder hierarchy to find matching files without resetting the search.