aggregator: Forward navigation events upstream
Continues !1350 (closed) and adds handlers for compositor and glvideomixerelement to properly translate and send events to only the relevant sink pads.
Fixes #888 (closed)
Edited by Vivienne Watermeier
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Continues !1350 (closed) and adds handlers for compositor and glvideomixerelement to properly translate and send events to only the relevant sink pads.
Fixes #888 (closed)