[Merge] ~3v1n0/ubuntu/+source/gnome-shell:ubuntu/bionic into ~ubuntu-desktop/ubuntu/+source/gnome-shell:ubuntu/bionic

[Marco Trevisan (Treviño)]

Well, I've rebased this.

So we can reuse the same PR.
This depends on https://code.launchpad.net/~3v1n0/ubuntu/+source/mutter/+git/mutter/+merge/366676
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https://code.launchpad.net/~3v1n0/ubuntu/+source/gnome-shell/+git/gnome-shell/+merge/362055
Your team Ubuntu Desktop is requested to review the proposed merge of ~3v1n0/ubuntu/+source/gnome-shell:ubuntu/bionic into ~ubuntu-desktop/ubuntu/+source/gnome-shell:ubuntu/bionic.