Not sure if this bug report is still relevant but since upgrading from 14.10 to 15.04, onboard (the keyboard or the floating icon) disappear in fullscreen mode. I noticed it with the presentation mode of evince and the fullscreen mode of comix/mcomix. you can go full screen and still get the floating icon on top but the icon disappear as soon as you click it and the keyboard doesn't show up (it's actually "behind" the fullscreen window). I'm using a microsoft surface and the only way to get out of fullscreen mode to get a keyboard back is to press the windows button on the screen.
Not sure if this bug report is still relevant but since upgrading from 14.10 to 15.04, onboard (the keyboard or the floating icon) disappear in fullscreen mode. I noticed it with the presentation mode of evince and the fullscreen mode of comix/mcomix. you can go full screen and still get the floating icon on top but the icon disappear as soon as you click it and the keyboard doesn't show up (it's actually "behind" the fullscreen window). I'm using a microsoft surface and the only way to get out of fullscreen mode to get a keyboard back is to press the windows button on the screen.