ubports/qtmir@b8f8b9e (Dont automaticly switch to newly placed window, let unity8 handle this) make qtmir stops automatically activating the new window. To make our mock mimicks qtmir better, we have to do that too. This is required to test the regression on the previous commit. This fails a few tests: - Shell::test_switchKeymap() fails because the prompt surface management is broken at the moment (TLWM doesn't manage them). As this test doesn't intended to test that, I added an activate() call on the prompt surface to make it work. - ActiveCallHint::test_activeHint() fails because it doesn't use TLWM thus nothing activates the newly-opened app. I adjusted the test to activate() the appropriate surface based on the case they're testing. - PhoneStage::test_launchAppWithSpreadOpen() fails. That's because the original test was essentially a "surprise launch" i.e. the launch that doesn't come from Unity8 itself but the outer source (e.g. launching from a terminal), thus it can't run TLWM::pendingActivation(). That doesn't work based on testing on a real phone. I separated the test into 2 cases: one of them test expected launch with pending Activation(), another test unexpected launch and has expectFail().