Shotwell scrolling results in white screen

[Ray Hendricks]

I have scaling set to 175% but everything except 100% results in the same bug.

Touchpad scrolling does not work in the image library view and when I grab the scroll bar with the mouse (trackpad) and scroll it down, the shotwell library window fills with white and shotwell needs to be restarted. I can reproduce this every time.

Note that if I switch to xorg, I don't get this error (but I can't do fractional scaling)

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: shotwell 0.26.3-1ubuntu1
ProcVersionSignature: Ubuntu 4.13.0-19.22-generic 4.13.13
Uname: Linux 4.13.0-19-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.6
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Wed Dec 20 01:23:34 2017
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-12-14 (6 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: shotwell
UpgradeStatus: No upgrade log present (probably fresh install)