Sébastien Blin authored Aug 25, 2020 and Adrien Béraud committed Aug 26, 2020

Some clients can try to get the data info in the DataTransferEvent's callback
this can provide a deadlock on infoMutex_. To prevent that, emitting the signal
on the main thread is necessary.

Change-Id: Ifca032e497272c3da9e2a866a23e4883a142d1e9