When I use the backspace key in RadRichTextEditor it causes visual artifacts to be left behind. It doesn't matter if I am deleting a selection or just one character. The artifacts disappear as soon as I press or click anything else (including pressing backspace again, on the KeyDown event).
See attached image.
The control (or affected visual area) should be invalidated when the backspace key is pressed.
I was able to eliminate all artifacts by overriding the KeyDown event and forcing the control to invalidate whenever the backspace key is pressed: