sidebar-row: don't explicitly clone NautilusFile
The "file" property is read-only, as it is handled via the "uri" property. There is no need to set it, it causes warnings.
Fixes first part of #3103
The "file" property is read-only, as it is handled via the "uri" property. There is no need to set it, it causes warnings.
Fixes first part of #3103