WIP: virtual sinks/sources: Fix crash with stacked virtual sinks or sources
Fixes #567
Currently, when the master of a virtual sink/source is moved, the change of the asyncmsgq is not propagated to other attached virtual sinks/sources. This leads to a crash when the original master sink/source is no longer available.
This patch fixes the issue by modifying the moving callback to propagate the change to attached virtual sinks/sources.
Edited by Georg Chini