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Use SystemUIDialog.setWindowOnTop to make user-switching dialogs not steal focus
There is still the problem that the dialogs show up under QS, but this change stops the dialog from stealing focus and thus deadlocking the UI Test: Add new user. Remove guest user. Note that you can then collapse QS Bug: 69591927 Change-Id: I489a094848c32d58e2bed4769bb249fbbef91ab5