I'm running Leap 42.1, x86_64, KDE 5.4.3, QT 5.5.1, Dolphin 15.12.1 and Emacs
24.3.1.
When I drag a file from Dolphin and drop it on an emacs window, nothing
happens. This worked on all previous Suse versions I used. The file used to be
opened in a new buffer.
I first suspected that emacs is the culprit, as it works with Kate as drop
target.
I then tried dragging from Konqueror on Emacs and it worked! It seems to be the
combination of Dolphin and Emacs that doesn't work.

I played with Krypton yesterday and it worked.