Currently, there is no visual feedback when the user presses the display key. The display key is a key often found on laptop keyboard. It allows to switch between different screen setups when more than one screen is connected, for example switching off the laptop screen, or external monitor.
When pressed, it currently cycles between the following
* Clone
* ExtendToLeft
* TurnOffEmbedded
* TurnOffExternal
* ExtendToRight
The above setup changes would be shown as OSD to display the setup changes. This OSD should end up on all screens.
When the key is pressed while only one screen is connected, it does nothing, and it doesn't give any visual feedback. An icon (or a message) indicating that this key is useless right now would be good. Ideas welcome for this case.
This is how it looks like in Windows, for some inspiration: https://i.stack.imgur.com/qvW2E.png
This task is pretty independent from the parent, and seems technically harmless, so it could be 5.8 material if we get if we get it done quickly.