EACCESS_DENIED when following symlink in $HOME outside of $HOME

After adding a graph following a symlink in the directory chooser dialogue, it is not possible to write to it.

An EACCESS error is thrown: Permission denied.

This is due to the sandboxing of the inherited file system link and the created portal file system within `/run/user/1000/doc/by-app/com.logseq.Logseq/(.*)` and within `/run/user/1000/doc/\1`.

After giving direct access to the inner symlink path and the outer real path of the desired directory with Flatseal, and using its absolute real path within the directory chooser, the graph could be written again.