[marziomont]

Problem

watchdog 7.0.0 changed PatternMatchingEventHandler to match patterns with PurePath.full_match() instead of PurePath.match(). full_match matches against the whole path, so the pickle core's "*" + filename pattern no longer matches an absolute event path such as /cache/dir/.module.func:

PurePath("/cache/dir/.module.func").match("*.module.func")       # True  (watchdog 6)
PurePath("/cache/dir/.module.func").full_match("*.module.func")  # False (watchdog 7)

A caller that finds an entry being calculated by another thread or process waits for the cache file to change. Under watchdog 7 the handler never fires, and with no wait_for_calc_timeout the waiter hangs forever.

cachier requires watchdog>=2.3.1 with no upper bound, so a fresh install picks up 7.x. uv.lock pins watchdog 6.0.0, which is why CI hasn't caught it.

Fix

CacheChangeHandler now subclasses FileSystemEventHandler and dispatches only the events whose source or destination file name equals the cache file's name. It ignores directory events. This matches by name instead of by glob, so it behaves the same under every watchdog version.

Tests

A new parametrized test checks the handler against full-path events: modified, created, a move onto the file, a sibling .lock file, another function's cache file, and a directory event.

Pickle core tests on Linux (Python 3.13, in Docker):

	watchdog 6.0.0	watchdog 7.0.0
master	13 passed	5 failed (the 2 existing being-calculated tests + 3 new)
this PR	13 passed	13 passed