Bug 477627

SUMMARY

Configuration of Metadata| Sidecar leads to confusing user experience. 


STEPS TO REPRODUCE
	1. Settings->Configure DigiKam…
		○ Metadata | Sidecars
			○ Disable: Read from sidecar files
			○ Enable: Write to XMP sidecar only
	2. Select picture
	3. Item->Edit metadata
		a. Change an arbitrary field
		b. Click apply

OBSERVED RESULT
Changed field reverts to original value

EXPECTED RESULT
Change is persistent

SOFTWARE/OS VERSIONS
Windows:  Windows 10 Home

ADDITIONAL INFORMATION
Although the behavior is consistent with the configuration, it is still confusing. Inexpert users would suspect a defect. 

Proposal

Provide settings of Metadata | sidecar like

	Use Sidecar:
		○ Don't use sidecar (metadata in items only)
		○ Use sidecars (read/write only to XML sidecar; fall-back reading from item if sidecar is unavailable)
		○ Duplicate (write metadata to XML sidecar and item, preferer sidecar on reading)
		○ As a substitute (if item is read-only: write to XML sidecar, prefer reading from XML sidecar. If item is writable: write to item, delete XML sidecar, prefer reading from item)