GStreamer: QGstreamerImageCapture - emit signals from app threadHEADdev

When emitting signals on QPlatformImageCapture, we need to make sure
they are invoked on the thread. So we defer the invocations when
emitting from a worker thread to the thread owning
`QGstreamerImageCapture`.
This also makes sure that we don't emit signals while holding a mutex.

Pick-to: 6.5 6.7
Change-Id: If53ae5622d2a3d62a146afa3f9b6585909967069
Reviewed-by: Jøger Hansegård <joger.hansegard@qt.io>
Reviewed-by: Artem Dyomin <artem.dyomin@qt.io>

0 files changed, 0 insertions, 0 deletions