[dolphin] [Bug 420614] New: Devices panel: "Hard disk of xxx.x GiB" displays a strange xxx.x value (NOT being GiB)

[Valdo]

https://bugs.kde.org/show_bug.cgi?id=420614

            Bug ID: 420614
           Summary: Devices panel: "Hard disk of xxx.x GiB" displays a
                    strange xxx.x value (NOT being GiB)
           Product: dolphin
           Version: 19.12.3
          Platform: Ubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: gnu4ever at netc.eu
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
Wrong calculation of disk partitions' capacity?

STEPS TO REPRODUCE
The "Hard disk" I'm mentioning is actually a disk partition.
Command 'df -k' lists a capacity of 294243128 blocks of 1K (that is, 280,6 GiB)
for a given partition.

OBSERVED RESULT
Dolphin's "Devices" panel displays 286.1 GiB (wrong) for that partition.

Note: same issue (if confirmed to be an issue - in all cases, pretty
misleading) observed with kdepartitionmanager, showing 286.10 GiB.
On the other hand, the Device properties (in Dolphin) show a capacity of 280,6
GiB (correct).

EXPECTED RESULT
According to me, Dolphin's "Devices" panel should display 280,6 GiB.

Note: the same expected result goes for kdepartitionmanager.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.18.4
KDE Frameworks Version: 5.68.0
Qt Version: 5.12.8

ADDITIONAL INFORMATION
Not sure whether there is a link with Bug 292795 or not (KDE4 at the time).

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