https://bugs.kde.org/show_bug.cgi?id=416744

--- Comment #13 from spam-recei...@web.de ---
(In reply to caulier.gilles from comment #12)
> No need a second computer. Use AppImage Linux bundle which include all in
> place in memory and do not install file on your computer. Just get the
> appimage version, change file as executable, and run it.

I was quite cumbersome, but finally I managed to run the appimage in the
Windows/Linux subsystem...
* installation of the Linux subsystem, installation of Ubuntu within the
subsystem
* installation of an X server on Windows, configuring it
* extracting the appimage because it can't be mounted
* installing a bunch of libraries
* and some more tweaking
The rendering will not be optimal with this setup, e.g. the face labels and
edit buttons will not be visible on the preview, and only parts of the face
rectangle. The tooltips of the confirm and remove buttons will be shown, this
helped me locating them...

Alright, back to topic:

It seems better now but not completely solved: 

I have some test photos. On those, the same faces are tagged twice because I
used different programs originally (WLPG and Picasa).

When I remove one of the rectangles with digikam, it will be removed from the
database but not from the file. The removed rectangle will re-appear when I
reload the metadata.

When I remove one of the rectangles and modify the other (move by a few
pixels), the removed one will not re-appear after reloading of metadata.

I've checked this with exiftool:

Original file and file after removing one face rectangle will prduce the same
output:
> exiftool test1.JPG | grep -i region
Region Name                     : Name A, Name A, Name B, Name B
Region Type                     : Face, Face, Face, Face
Region Area X                   : 0.54475, 0.5435, 0.433375, 0.4345
Region Area Y                   : 0.4145, 0.431667, 0.283333, 0.297
Region Area W                   : 0.1095, 0.0575, 0.11425, 0.0645
Region Area H                   : 0.174333, 0.0766667, 0.183333, 0.086

After moving one other rectangle a bit:
> exiftool test1.JPG | grep -i region
Region Name                     : Name A, Name A, Name B
Region Type                     : Face, Face, Face
Region Area X                   : 0.5435, 0.54475, 0.432625
Region Area Y                   : 0.431667, 0.4145, 0.288
Region Area W                   : 0.0575, 0.1095, 0.11425
Region Area H                   : 0.0766667, 0.174333, 0.183333

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