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file-operations: Preserve permissions copying from r/o non-isofs mounts

Fina Wilke requested to merge felinira/nautilus:fina/fuse-readonly-copy-permissions into main

When copying files from readonly mounts we only reset the permissions of the source if those are of filesystem type isofs. The original behaviour was meant to be a workaround for isofs optical disks [1][2] for which the kernel driver sets permissions of all inodes to r-x if the POSIX permission extension (rock ridge) is not available [1].

As we can't detect the presence of such an extension from gio we can only guess and reset the permissions for all isofs mounts. This is still wrong [3], but reduces the scope of the bug to isofs.

[1] https://bugzilla.gnome.org/show_bug.cgi?id=167102 [2] https://bugzilla.gnome.org/show_bug.cgi?id=550816 [3] #2873 (closed)

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