Gnome; Remote Desktop prompt appears when changing workspace

Unfortunately, disabling this completely breaks UI tests (in my case Java AssertJ Swing tests):

Caused by: java.awt.AWTException: java.awt.Robot requires your X server support the XTEST extension version 2.2
    at sun.awt.X11.XRobotPeer.setup(Native Method)
    at sun.awt.X11.XRobotPeer.<init>(XRobotPeer.java:51)
    at sun.awt.X11.XToolkit.createRobot(XToolkit.java:958)
    at java.awt.Robot.init(Robot.java:171)
    at java.awt.Robot.<init>(Robot.java:164)
    at org.assertj.swing.util.RobotFactory.newRobotInLeftScreen(RobotFactory.java:58)
    at org.assertj.swing.image.ScreenshotTaker.<init>(ScreenshotTaker.java:66)
    ... 21 more