Kate/Kwrite editor drag/drop/copy functionality gone

Somehow I've lost some functionality in Kate and Kwrite which I've employed frequently. In the past, as recently as a couple hours ago, I could select some text and drag-and-drop it elsewhere. If the CRTL key was held, it copied the selection rather than moving it. I have not changed any system setting, nor any config options for Kate and/or Kwrite recently. I am certain I managed to hit some key combination which turned off this feature, though I'm lost as to what that might have been. As a test, just in case it was related to an update, I rolled both editors back to ver 18.12.3 to no effect. Including after a complete power-cycle to be sure memory was cleared. Any ideas of how I managed to turn off this feature, and how to restore it? Potentially pertinent system info:

Distro: openSUSE Leap 15.1
Kernel: 4.12.14-lp151.28.20-default
Plasmashell: 5.17.0
KDE Frameworks: 5.63.0
QT: 5.13.1
Kate: 19.08.2
Kwrite: 19.08.2
KatePart: 5.63.0

--- After some experiments I have found I can get the drag-drop-copy functionality by using a middle-drag. Perhaps knowing that will help to determine what was changed to remove the prior method. I've not had the spare time to make any changes in my keyboard/desktop settings, intentionally anyway. I have reviewed the recent updates and nothing seems like it should have affected the libraries involved in either the desktop, or the editors. While I have a work-around, I'd still prefer that I could use the CTRL drag to which I've become accustomed, and which still works in Dolphin.