Added a hack to set the ZoomSlider state to "visible" when zoom keys get pressed.
Added a hack to set the ZoomSlider state to "visible" when zoom keys get pressed.

mlehtima/cameraplus,mlehtima/cameraplus,foolab/cameraplus,alinelena/cameraplus,foolab/cameraplus,alinelena/cameraplus,foolab/cameraplus,alinelena/cameraplus,mer-hybris-kis3/cameraplus,mer-hybris-kis3/cameraplus,mlehtima/cameraplus,alinelena/cameraplus,mer-hybris-kis3/cameraplus,mlehtima/cameraplus,mer-hybris-kis3/cameraplus,foolab/cameraplus