issue with creating new layer in gallery when using wacon cintiq

[handrawn]

a tap on the new layer button with the pen almost always creates lots of layers at once eg:



sometimes some of the new layers are copies of themselves... and copies of copies...

my wacom drivers and windows 10 are both the latest versions [wacom 6.3.30-2 and windows 1803 17134.122]

it happens in xdpx11 and 12.6 and 15.1 [trial]

it's a while since I used cintiq with xara, usually I'd use a mouse to create layers, but i think this issue is not new....