Strange black frame outside of windows on F29 and mixed-dpi screens
When I drag windows from my HD screen to my UHD screen, windows get that frame shown in the screenshot below. When I drag them back to the HD screen, that freme disappears (and reappears back at the UHD screen).
mutter-3.30.0-1.fc29.x86_64
● ostree://fedora-workstation:fedora/29/x86_64/silverblue
Version: 29.20180923.n.0 (2018-09-23 11:31:15)
BaseCommit: a1d5676c3f679387bd5d56aef7f898fcbdcc3cc150ad46d862469f20b0c4e56c
GPGSignature: Valid signature by 5A03B4DD8254ECA02FDA1637A20AA56B429476B4
LayeredPackages: adapta-gtk-theme adobe-source-code-pro-fonts
adobe-source-sans-pro-fonts adobe-source-serif-pro-fonts
android-tools atomic baobab cheese chrome-gnome-shell chromium
dconf-editor dnf easytag exa exfat-utils fd-find ffmpeg
file-roller file-roller-nautilus gcc git glances
gnome-encfs-manager gnome-logs gnome-screenshot gnome-tweaks
gnome-usage gpick hack-fonts htop iftop julia libratbag-ratbagd
linux-libertine-biolinum-fonts linux-libertine-fonts mosh
mozilla-fira-mono-fonts mozilla-fira-sans-fonts neovim
powerline-go pv ripgrep task tilix tilix-nautilus tmux tokei
xenlism-wildfire xenlism-wildfire-midnight youtube-dl zsh
LocalPackages: rpmfusion-nonfree-release-29-0.5.noarch
rpmfusion-free-release-29-0.5.noarch