According to KDE BTS at the linked KDE report 127836, this is "a window manager issue, afaict". I would add a remote bug watch for the new report at KDE, 130063, but Launchpad's lauout has been changed again, and am unable to find that option.
** Changed in: amarok (Ubuntu) Sourcepackagename: amarok => kwin -- AmaroK does not gain focus when it is dragged and dropped to https://launchpad.net/bugs/46036 -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs