Comment 54 for bug 402892

I'm adding the following, so searches of this symptom will also find this thread:

Once the bug is triggered, it also repeatably affects LibreOffice Calc - if you click-select a worksheet tab or drag-select a set of cells then release mouse, it enters drag-and-drop mode, and (strangely) draws a thick border around the selection, which you cannot undo or reformat.

I can exit DND mode with ESC. And temporarily remove the problem with the xinput solution, but
I agree with #53 that disabling touch screen is insufficient - you need to re-enable too.

System details:
Lenovo Yoga 3 Pro with ATML1000:00 03EB:8A10 touch screen
20.04.1-Ubuntu (although this bug has been affecting previous versions for me)
Linux kernel 5.8.0-48-generic