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BackingFile property should be use with StorageVolume instead of StorageAccess

Kwon-Young Choi requested to merge kchoi/dolphin-plugins:bug434617 into release/21.04

BUG: 434617

When mounting an iso with udisksctl, first a loop device is created /dev/loop0 then a second device /dev/loop0p1 is used to mount it on a filesystem location.

Querying for StorageAccess devices sometimes only returns the /dev/loop0p1 device without the /dev/loop0 device and the BackingFile property does not work on /dev/loop0p1.

Solution: query for StorageVolume instead which returns all loop devices: /dev/loop0 and /dev/loop1.

Warning: Because StorageVolume returns more devices, the function getDeviceFromBackingFile could be a little bit slower.

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