RFR: 8346722: (fs) Files.probeContentType throws ClassCastException with custom file system provider [v3]

[Brian Burkhalter]

> Ensure the file type detection works with a custom default file system provider.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8346722: Add bug tag to test

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23019/files
  - new: https://git.openjdk.org/jdk/pull/23019/files/1be60915..a8b205a7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23019&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23019&range=01-02

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23019.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23019/head:pull/23019

PR: https://git.openjdk.org/jdk/pull/23019