Initially adopt current brightness of external brightness device
Sits on top of MR !6596 (closed), let's get that one figured out first. Requires libraries/plasma-wayland-protocols!86 (merged) and works in tandem with powerdevil!450 (merged).
Is there any chance this could also get backported to 6.2 to fix BUG: 494408? Or is that impossible if a new protocol version is required?
This prevents KWin from amping up every display's brightness to 100% after a 6.2 update. Subsequent changes through a monitor's OSD menu or another software's DDC/CI commands are still ignored.
Depends on an interface addition to external-brightness-v1 from plasma-wayland-protocols.
Bonus commit: wayland/externalbrightness: Fix order of id and version arguments
QWayland places id before version, and the code in
kde_external_brightness_v1_create_brightness_control() will
pass these arguemnts to the ExternalBrightnessDeviceV1 constructor
in that order.
However, the ExternalBrightnessDeviceV1 constructor signature
itself has them swapped, which luckily didn't cause problems because
the call to QtWaylandServer::kde_external_brightness_device_v1()
also passes the arguments in the wrong order, swapping them back.
This commit makes the constructor use the correct order in the first place.