SUMMARY:

    In the normal case, in Dolphin, dragging-and-copying an item into a "tag" folder adds the new tag to the item.

    However dragging-and-copying an item into a "tag" folder that already contains an item with an identical filename, silently fails to add the tag

STEPS TO REPRODUCE:

    1. Create a couple of subfolders under ~/Pictures; 2020-02-20, 2020-02-21

    2. Create image files in these folders, for example:

        ~/Pictures/2020-02-20/image.png
        ~/Pictures/2020-02-21/image.png 

    3. Tag the .../2020-02-20/image.png with a tag "mytag", split the display and open the "mytag" folder.

    4. Drag-and-copy the second file, .../2020-02-21/image.png, into the the "mytag" folder

OBSERVED RESULTS:

    The tag is not added. No error is given.

EXPECTED RESULTS:

    The tag should be added and "name clash" in the tag folder resolved by appending a "(1)" as Dolphin does in other situations.

SOFTWARE/OS VERSIONS:

    Dolphin 19.12.2
    from Neon 5.18

    KDE Plasma 5.18.1
    KDE Frameworks 5.67.0
    Qt 5.14.1