Read-only accessor * Throws if asked for a signal outside of the intercepted array, returns nullptr if handler hasn't yet * been initialised

For our convenience when doing calculations we clamp the dimensions of the aspect ratio so they will fit into a long without overflow.

Overrides from shell::FocusController @{

Transforms a relative position within the display bounds described by \a rect which is rotated with \a orientation

Mostly to account for CI slowness. Adds a virtual device and waits till it's added before proceeding