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Carlos Garnacho authored
On the devices and backends that support it, this signal will be emitted on slave/floating devices whenever the tool they are interacting with changes. These notifications may also work as a sort of proximity events, as the tool will be unset when the pen moves too far. For backends, gdk_device_update_tool() has been included, all that should be done on their side is just calling this whenever any tool might have changed.
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