digikam, qt file selector, bad access to user folder tree

opensuse 42.2 x86_64
digikam 5.3.0 with qt 5.6.1
digikam 5.4.0 with qt 5.7.0

in digikam
if i import photos or folder
then
i get a qt file selector
this one is not populated with user or system shortcuts which i have with dolphin file selector
then
i can't reach:

• easily any folder
• my smartphone connected via wifi with kdeconnect or via bluetooth with bluedevil

see attachements

digikam team member Gilles Caulier said "this is a qt problem"