Speed up native + hybrid indexing's ignore filtering

Hash-set the ignored-files / ignored-directories / globally-ignored-
directory-names lists once per indexing call, instead of repeating
linear `member' scans on every file. On a project with N files and M
ignore entries this drops the inner work from O(N*M) to roughly O(N).

In the native walker (`projectile-index-directory') three additional
changes:

* Glob patterns for `.projectile' ignore/ensure are pre-expanded once
  per directory level, instead of once per (file, pattern) pair via
  `file-expand-wildcards' inside `projectile-check-pattern-p'.
* Discovered files accumulate into a single mutable cell threaded
  through the recursion, so we don't pay for an `apply append' at each
  level (which copied every file once per level it bubbled through).
* `default-directory' is rebound for glob expansion, but only after
  the directory listing is captured - so callers can still pass a
  relative `directory' argument.

In the hybrid post-processor (`projectile-remove-ignored'), pre-split
ignored-dirs into prefix-match and any-segment groups and hash the
segment names. The per-file segment loop becomes a hash lookup; the
basename match against ignored-files is now also a hash lookup.

The public functions (`projectile-ignored-file-p', `projectile-
ignored-directory-p', `projectile-ignored-rel-p',
`projectile-check-pattern-p') keep their existing signatures and
behaviour for external callers.

0 files changed, 0 insertions, 0 deletions