Super key always applied for VNC session

This a regression report for bug 1440570 with the latest package installed on 14.04 Trusty.

Problem still reproduces exactly as specified. Every time I press 'N' in terminal over VNC, a new window is opened. I don't want to delete my super key mappings, they are quite useful when interacting with the machine locally but I also need remote access to things like a web browser and VNC is most useful for this.

Unfortunately the super key is constantly on. I saw that 1440570 was closed with a fix, I might have undone the fix because I used gnome-tweak-tool to swap my Alt-Win keys (Alt-Win behavior under typing). Even after switching this back however, the problem persists over VNC, making it unusable.

Let me know what I can do to help debug.

Output of apt list metacity:

Listing... Done
metacity/trusty-updates,now 1:2.34.13-0ubuntu4.1 amd64 [installed]

Output of lsb_release -rd:

Description: Ubuntu 14.04.5 LTS
Release: 14.04

#regression-update

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8.1
ProcVersionSignature: Ubuntu 4.4.0-62.83~14.04.1-generic 4.4.40
Uname: Linux 4.4.0-62-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.23
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
Date: Mon Feb 13 11:40:39 2017
DistUpgraded: Fresh install
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-trusty-amd64-osp1-20150720-0
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
 oem-audio-hda-daily-lts-xenial, 0.201611160201~ubuntu14.04.1, 4.4.0-62-generic, x86_64: installed
 synaptic-i2c-hid-3.13.0-32-backport, 1.6.4: added
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 Intel Corporation Sky Lake Integrated Graphics [8086:1912] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:06b9]
InstallationDate: Installed on 2016-12-16 (59 days ago)
InstallationMedia: Ubuntu 14.04 "Trusty" - Build amd64 LIVE Binary 20150720-04:06
MachineType: Dell Inc. OptiPlex 7040
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-62-generic.efi.signed root=UUID=e4b640d9-85ce-43f1-9369-2744897fd9f5 ro pcie_aspm=off quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/12/2016
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.4.9
dmi.board.name: 0Y7WYT
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.4.9:bd09/12/2016:svnDellInc.:pnOptiPlex7040:pvr:rvnDellInc.:rn0Y7WYT:rvrA00:cvnDellInc.:ct3:cvr:
dmi.product.name: OptiPlex 7040
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.11.3+14.04.20160425-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1ubuntu0.14.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri N/A
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core N/A
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
xserver.bootTime: Wed Feb 8 15:18:04 2017
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 16485
 vendor DEL
xserver.version: 2:1.18.3-1ubuntu2.3~trusty1