Dock Widgets only support floating

QGCApplication.pro

src/FlightDisplay/FlightDisplayView.cc

src/FlightDisplay/FlightDisplayWidget.cc

src/FlightDisplay/FlightDisplayWidget.h

src/MissionEditor/MissionEditor.cc

src/QGCDockWidget.cc

src/QGCDockWidget.h

src/QGCQmlWidgetHolder.cpp

src/QGCQmlWidgetHolder.h

src/QmlControls/QmlTestWidget.cc

src/QmlControls/ScreenToolsController.cc

src/VehicleSetup/SetupView.cc

src/ViewWidgets/CustomCommandWidget.cc

src/ViewWidgets/CustomCommandWidget.h

src/qgcunittest/PX4RCCalibrationTest.cc

src/ui/HILDockWidget.cc

src/ui/HILDockWidget.h

src/ui/MainWindow.cc

src/ui/MainWindow.h

src/ui/MultiVehicleDockWidget.cc