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wacom: Use Mutter's input mapping interface to show calibration UI

Carlos Garnacho requested to merge wip/carlosg/tablet-calibration-ui-mapping into main

When the "Automatic" mapping is chosen for a display-attached tablet device, Mutter is in charge of applying the heuristics to map the tablet device to its most likely attached display.

When that happens, the Wacom panel does not know better (or anything) to show the calibration UI than picking a GdkMonitor and hoping for the best.

To improve this situation, Mutter has been added a D-Bus interface so it is possible to query it for the output that a tablet device is mapped to. This commit adds the support for this interface, so that the Wacom panel does know to pick the right GdkMonitor to fullscreen the calibration UI on.

(depends on mutter!2605 (merged))

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