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Currently, the test passes because the activities controller doesn't have enough time to fetch all activities. So, the test client won't be placed on the current activity. Since the Workspace is now created before starting the Xwayland, we now spin the event loop, which allows the activities controller to fetch the list of all activities and so the test client will be placed on the current activity, i.e. client->isOnAllActivities() will no longer return true. This change fixes wrong assumptions in the test and makes it robust.
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