gnome-shell-extensions-common from GNOME:STABLE:3.34 project

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For SLE 15 SP2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/GNOME:STABLE:3.34/SLE_15_SP2/GNOME:STABLE:3.34.repo
zypper refresh
zypper install gnome-shell-extensions-common