Based on dle8's CL 414454, wire in directoryFilters into the goimports
ModuleResolver scan. A few changes/fixes/additions from that CL:
- Fix a bug in filter validation that was causing -**/a not to validate.
- Fix a bug in regex building where -a was not treated as an excluded
prefix (it was matching 'a' anywhere).
- Use absolute paths in the SkipPathInScan, so that we can evaluate
directory filters relative to the workspace folder.
- Add several regression tests.
- Consolidate directoryFilters regression tests under a new
directoryfilters_test.go file.
- Add several TODOs.
Fixesgolang/go#46438
Change-Id: I55cd3d6410905216cc8cfbdf528f301d67c2bbac
Reviewed-on: https://go-review.googlesource.com/c/tools/+/420959
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
gopls-CI: kokoro <noreply+kokoro@google.com>
Reviewed-by: Dylan Le <dungtuanle@google.com>