Skip cache for projectile-root-local (#1211)

projectile-root-local reads the buffer-local projectile-project-root
variable rather than inspecting its DIR argument, so caching its
result by (FUNC . DIR) was wrong: two buffers visiting the same
directory but with different file-local overrides would share the
first buffer's cached answer.  Skip the cache for this function
specifically - it's a single variable read, no FS work to amortize.

Adds a regression test that visits two buffers with different
file-local roots from the same default-directory and confirms each
sees its own override.

0 files changed, 0 insertions, 0 deletions