uses too tiny cursor image on high-dpi

[Andreas E.]

When doing a long press, the cursor image changes into half of the correct size (showing the orange timer animation until the secondary click is triggered).
After turning mousetweaks off and on again (unity-control-center → Universal Access → Pointing and Clicking → Simulated secondary click), the cursor displays always the correct size, also during long press.

pre-conditions:
- hi-dpi screen with UI scale 2.0 (org.gnome.desktop.interface.scaling-factor=2)
- default cursor theme (DMZ-White)

Expected behavior:
As the system displays the cursor normally in 2.0 scale, this should also be the case for mousetweaks.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: mousetweaks 3.12.0-1ubuntu2
Uname: Linux 4.2.0-040200rc3-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Jun 8 12:25:05 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-06-06 (367 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
SourcePackage: mousetweaks
UpgradeStatus: Upgraded to xenial on 2016-05-12 (26 days ago)