Quarto not detecting subdirectories when using symlinks

Bug description

Quarto is failing to render a simple document with error

ERROR: Refusing to remove directory /g/data/lo70/ec0044/ensoceof/analysis/test/test_files that isn't a subdirectory of /home/565/ec0044/ensoceof/analysis/test

In my case, /home/565/ec0044/ensoceof/ is a symlink to /g/data/lo70/ec0044/ensoceof/, so the error is not correct. This only happens when using positron and not in RStudio or the terminal. I believe the reason might be that positron does

quarto preview /home/565/ec0044/ensoceof/analysis/test/test.qmd --no-browser --no-watch-inputs --output-dir /scratch/lo70/ec0044/tmp/tmp-2028405-xv6VpRj8kWE3 --embed-resources

while RStudio does

quarto preview test.qmd --to html --no-watch-inputs --no-browse

That is, Positron is specifying an absolute path, while RStudio is using a relative path.

In any case, the command using absolute paths should not fail here. It seems an issue with the logic trying to detect subdirectories. I supposed it could be fixed by using the realpath of each dir. (realpath /home/565/ec0044/ensoceof/analysis/test is /g/data/lo70/ec0044/ensoceof/analysis/test).

Steps to reproduce

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Actual behavior

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Expected behavior

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Your environment

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Start by reproducing the Positron command with the symlinked project path and compare it with the relative-path command used by RStudio. Trace the directory-containment check that emits the refusal, then verify that equivalent real paths are accepted without allowing unrelated directories.