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I see ideas about combine activities with virtual desktops.

Sometimes, I need to fast switch into given virtual desktop and activity. It could be helpful to do by clicking on virtual desktop (workspace) in activity tile (present on activity switcher/panel). I think workspaces could be displayed in bottom-right corner.

Another solution is to change virtual desktop switcher.

Add handler for long-left mouse click: display activity switcher near desktop switcher. Current activity will be hidden on it and on each displayed activity show desktop switcher.