Enhance FileAccessError on a parent detection.

[herve-er]

If an application (e.g., Microsoft Money) creates a locked file, the localfilesystemobserver will not be able to read its attributes and will call handleAccessDenied.

Since the item is not present in the snapshot, handleAccessDenied will assume that the permission issue originates from the parent directory and will therefore blacklist the parent.

The problem is that in this case, this assumption is incorrect; the issue does not come from the parent directory.

When the parent directory is later unblacklisted, most files within it will be synced again, often leading to pseudo-create conflicts.

However, if one of the files in the folder has been modified, it will be blacklisted because it is not a pseudo conflict but a genuine one. This scenario is highly likely, as demonstrated in this specific case: Microsoft Money systematically modifies a file in the folder after generating a locked temporary file.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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