Ignored Files/Dir should allow for matching directory specific files and subdirectories

[distinctjuggle]

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Feature request

Which Nextcloud Version are you currently using: Latest / Irrelevant / 3.14.x

Describe the solution you'd like
It'd be nice if you could specify a particular parent directory name for ignoring files. For example, say I want to ignore the file OR directory named bar, but only when it is inside of foo. I could put either of the following entries for the desired use case:

foo/bar
foo/bar/

If these entries respected the parent directory name, then any other folders not named foo would allow for bar to continue to be synced. This adds a layer of functionality to the pattern matching so that a very particular use case can be accomplished, and prevent the unnecessary ignoring of syncing in other places.

Describe alternatives you've considered
The only alternative which seems to exist is blocking the entire bar/ directory regardless of the parent foo/'s presence or not. This will often be okay, but in particular circumstances it may not be desirable. For example, when building Rust applications there are many files created in target/debug/ and target/release/. Nextcloud struggles with syncing a lot of tiny files, and there's really nothing important in these directories which requires syncing anyways. If many Rust project folders are present within a Nextcloud directory, it can be desirable to specifically block target/debug/ and target/release/ while not impacting other target folders for other build projects. Unfortunately, the only existing solution seems to be to block all target/ directories as of present.

I looked for duplicates, but I didn't see any. Apologies if I missed one.