When follow mode != none dunst cannot detect what output is being used
to display the notification (yet). With this commit dunst falls back to
using the largest scale from any ouput. The compositor should scale the
buffer down again if the scale of the output is smaller that the used
scale.
This commit implements support for HiDPI rendering for wayland. X11
should be unaffected by this.
It is implemented by scaling everything that's rendered by a scale
factor that's obtained from the wayland protocol. All sizes before
rendering remain the same, so the same settings should provide the same
output for different scaling factors, only scaled by that factor.
As far as I know, it's not possible to differentiate keyboard and
mouse focus, so they behave the same. This commit also fixes
a bug where a NULL pointer was dereferenced.
When the user doesn't have a seat, or their compositor doesn't support the idle
protocol, we'll assume that they are not idle.
Also, rename wl_output to something that doesn't exist yet.
