aspectcropratio: Set caps from the streaming thread on property changes
Otherwise it might lead to deadlocks
See https://gitlab.gnome.org/GNOME/pitivi/issues/2259
Added test in -validate, see:
Edited by Thibault Saunier
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Otherwise it might lead to deadlocks
See https://gitlab.gnome.org/GNOME/pitivi/issues/2259
Added test in -validate, see: