App indication alwas triggered on joined displays

[null-git]

If I connect an external monitor to my laptop and use joined displays, any app on my external display will cause the workspaces-bar to mark all workspaces as having an active app (and thus rendering this feature pretty useless). It would be great if they would only be marked as such if the have windows on the primary display. And as long as workspaces are only configured for the primary display.