[wayland] Call SeatInterface::notifyTouchCancel when dpmsModeChanged
Call SeatInterface::notifyTouchCancel when outputs dpmsModeChanged Fix bug of incorrect touchscreen behavior after waking up outputs
STEPS TO REPRODUCE:
- Disable screen locking after waking from sleep
- Set power button events handling to "Turn off screen"
- Press and hold the touchscreen with two fingers
- Press power button. The output will turn off (via dpms).
- Release the touchscreen.
- Press power button again. The output will turn on.
- Try using touchscreen with one finger.
EXPECTED RESULT: Touchscreen works fine
OBSERVED RESULT: Touchscreen always remains pressed