x/tools/gopls: support features (diagnostics, etc.) for open files inside of vendor directories

[calbot]

There should be some kind of message maybe in the gopls (server) output stating that a message wasn't recorded to PROBLEMS because it is from a file inside a "vendor" folder.

Also, maybe errors should be reported to PROBLEMS if you open code inside a folder which is a subfolder of vendor since you're probably developing in the vendored project itself.

[ioworker0]

There should be some kind of message maybe in the gopls (server) output stating that a message wasn't recorded to PROBLEMS because it is from a file inside a "vendor" folder.

Also, maybe errors should be reported to PROBLEMS if you open code inside a folder which is a subfolder of vendor since you're probably developing in the vendored project itself.

I have resolved this issue, maybe you can try it?

index 8914d0dc..b7213f50 100644
--- a/internal/lsp/cache/load.go
+++ b/internal/lsp/cache/load.go
@@ -440,7 +440,7 @@ func (s *snapshot) setMetadata(ctx context.Context, pkgPath packagePath, pkg *pa
                // The package's files are in this view. It may be a workspace package.
                if strings.Contains(string(uri), "/vendor/") {
                        // Vendored packages are not likely to be interesting to the user.
-                       continue
+                       // continue
                }

                switch {
(END)