xfce4-panel-plugin-whiskermenu from openSUSE:Leap:15.1 project

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For standard run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:Leap:15.1/standard/openSUSE:Leap:15.1.repo
zypper refresh
zypper install xfce4-panel-plugin-whiskermenu