Directive "follow" does not follow symlinks outside of repository

[felberj]

What version of gazelle are you using?

commit b8e12463a6185c2303e4ac2a83f9b20ec76e099c (HEAD, origin/master, origin/HEAD)
Author: Gregor Best <gbe@unobtanium.de>
Date:   Wed Jul 5 18:11:56 2023 +0200

    Fix directive table in Readme file (#1571)

What version of rules_go are you using?

n/a

What version of Bazel are you using?

% bazel version
bazel version
Starting local Bazel server and connecting to it...
Build label: 6.2.0-homebrew
Build target: bazel-out/darwin_arm64-opt/bin/src/main/java/com/google/devtools/build/lib/bazel/BazelServer_deploy.jar
Build time: Tue Jan 1 00:00:00 1980 (315532800)
Build timestamp: 315532800
Build timestamp as int: 315532800

Does this issue reproduce with the latest releases of all the above?

yes

What operating system and processor architecture are you using?

macOS ARM64

What did you do?

# BUILD
# gazelle:follow external

external is a symlink:

% ls -alh external
ls -alh external
lrwxr-xr-x  1 me  staff    27B Apr 19 19:45 external -> bazel-out/../../../external

Running gazelle with

update --mode=diff

What did you expect to see?

It shows diff in external (actually, I just want gazelle to "read" build files in external, but this is what I got)

What did you see instead?

No diff under external

I assume this is a side effect of #1384. I would like to add a feature that if I explicitly add the link to "follow", it should follow it.