SUMMARY

Image editor can only be invoked once from digikam's main window

STEPS TO REPRODUCE
1. In an album, select a picture
2. Click Image Editor button
3. Image editor opens (albeit, without its menu)
4. Close image editor
5. In main window, click Image Editor button again

OBSERVED RESULT
After Step 5, an image editor window with a white background (and nothing else) appears. At the same time, the following message is printed to STDERR:

digikam.geoiface: ----
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 48058, resource id: 96469350, major code: 19 (DeleteProperty), minor code: 0

... and after closing the useless image editor:
digikam.geoiface: ----



EXPECTED RESULT
Image editor should appear normally (i.e. with selected photo), even when opening it the second time.



SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Linux 4.19.0-5-amd64, Debian 10, KDE 5.54.0-1
(available in About System)
KDE Plasma Version: 4:5.14.5.1-1
KDE Frameworks Version: 
Qt Version: 5.11.3

ADDITIONAL INFORMATION