Support filter text expansion and '/' notation for folders in the breadcrumb

[kieferrm]

Issue Type: Feature Request

This is a complement to #55076 but still independent.

The breadcrumb is not yet optimized for switching to a file in a different folder. When searching for a folder and I have a prefix match RightArrow should expand my filter text with the first highlighted match. Appending '/' should then allow me to continue searching inside that folder. The folder should autoexpand and the matches be highlighted.

VS Code version: Code - Insiders 1.26.0-insider (5fae91d, 2018-07-25T01:56:56.548Z)
OS version: Darwin x64 16.7.0

[jrieken]

I like, but tricky...

[jrieken]

The problem with searching is that we don't know (yet) the child items (for files). It would require integrating file search for that (as we do in quick open)...

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