simlinks break `@import` resolution

[thrombe]

Zig Version

0.16.0

ZLS Version

0.16.0

Client / Code Editor / Extensions

helix

Steps to Reproduce and Observed Behavior

• clone https://github.com/thrombe/zls
• git checkout import-bugs
• cd examples/simlink
• open code editor (in my case, helix)
• trigger goto definition on @import("vulkan"). it fails

but

• cd examples/simlinked
• open code editor
• trigger goto definition on @import("vulkan")
• this time, it resolves correctly

more detailed instructions and issue explation after my debugging.
https://github.com/thrombe/zls/blob/import-bugs/examples/simlinked/README.md

Expected Behavior

goto definition should work even when projects are opened via simlinks.
we know the setup is correct because zig build run works fine.

Attach ZLS log output

logs after opening main.zig via examples/simlink and triggering goto definition on @import("vulkan") a few times

zls.log

info  ( main ): Starting ZLS      0.16.0 @ '/nix/store/gyznl9c2gb73126ricbv96dsd673b5b1-zls/bin/zls'
info  ( main ): Log File:         /home/issac/.cache/zls/zls.log (info)
info  ( main ): Loaded config:    /home/issac/.config/zls.json
info  (server): Client Info:      helix (25.07.1 (a05c151b))
info  (server): added Workspace Folder: file:///home/issac/daata/repos/checkout/code_read/zls/examples/simlink (2 files)
info  (server): Set config option 'build_on_save_args' to ["-fincremental"]
info  (server): Set config option 'builtin_path' to "/home/issac/.cache/zls/builtin.zig"
info  (server): Set config option 'zig_lib_path' to "/nix/store/19cahh4irrwrj16dl4sbzll0ygn406ap-zig-0.16.0/lib"
info  (server): Set config option 'zig_exe_path' to "/nix/store/19cahh4irrwrj16dl4sbzll0ygn406ap-zig-0.16.0/bin/zig"
info  (server): Set config option 'build_runner_path' to "/home/issac/.cache/zls/build_runner/0536d83f23cda18cf0a02d9cd4e6dce4/build_runner.zig"
info  (server): Set config option 'global_cache_path' to "/home/issac/.cache/zls"
info  (store ): Loaded build file 'file:///home/issac/daata/repos/checkout/code_read/zls/examples/simlink/build.zig'
info  (store ): Loaded build file 'file:///home/issac/daata/repos/checkout/code_read/zls/build.zig'

after adding a log just above this line

zls.log

info  ( main ): Starting ZLS      0.16.0 @ '/home/issac/daata/repos/checkout/code_read/zls/zig-out/bin/zls'
info  ( main ): Log File:         /home/issac/.cache/zls/zls.log (debug)
info  ( main ): Loaded config:    /home/issac/.config/zls.json
info  (server): Client Info:      helix (25.07.1 (a05c151b))
debug (server): Offset Encoding:  'utf-8'
info  (server): added Workspace Folder: file:///home/issac/daata/repos/checkout/code_read/zls/examples/simlink (2 files)
debug (server): Dynamically registering method 'workspace/didChangeWatchedFiles'
info  (server): Set config option 'build_on_save_args' to ["-fincremental"]
info  (server): Set config option 'builtin_path' to "/home/issac/.cache/zls/builtin.zig"
info  (server): Set config option 'zig_lib_path' to "/nix/store/19cahh4irrwrj16dl4sbzll0ygn406ap-zig-0.16.0/lib"
info  (server): Set config option 'zig_exe_path' to "/nix/store/19cahh4irrwrj16dl4sbzll0ygn406ap-zig-0.16.0/bin/zig"
info  (server): Set config option 'build_runner_path' to "/home/issac/.cache/zls/build_runner/0536d83f23cda18cf0a02d9cd4e6dce4/build_runner.zig"
info  (server): Set config option 'global_cache_path' to "/home/issac/.cache/zls"
info  (store ): Loaded build file 'file:///home/issac/daata/repos/checkout/code_read/zls/examples/simlink/build.zig'
info  (store ): Loaded build file 'file:///home/issac/daata/repos/checkout/code_read/zls/build.zig'
debug (default): association resolution file:///home/issac/daata/repos/checkout/code_read/zls/examples/simlink/src/main.zig file:///home/issac/daata/repos/checkout/code_read/zls/examples/simlinked/.zig-cache/o/afde9d823e24ab77099cb5a57ee85275/vk.zig
debug (default): association resolution file:///home/issac/daata/repos/checkout/code_read/zls/examples/simlink/src/main.zig file:///home/issac/daata/repos/checkout/code_read/zls/examples/simlinked/zig-pkg/vulkan-0.0.0-r7YtxyBsAwD35FvkFhT2xruTNdCByD3TtGw44XWtfun8/src/main.zig
debug (default): association resolution file:///home/issac/daata/repos/checkout/code_read/zls/examples/simlink/src/main.zig file:///home/issac/daata/repos/checkout/code_read/zls/examples/simlinked/zig-pkg/vulkan-0.0.0-r7YtxyBsAwD35FvkFhT2xruTNdCByD3TtGw44XWtfun8/src/vulkan/generator.zig
debug (default): association resolution file:///home/issac/daata/repos/checkout/code_read/zls/examples/simlink/src/main.zig file:///home/issac/daata/repos/checkout/code_read/zls/examples/simlinked/zig-pkg/vulkan-0.0.0-r7YtxyBsAwD35FvkFhT2xruTNdCByD3TtGw44XWtfun8/src/xml.zig
...