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RegionFactory::CheckNewRegion signal is emitted directly after region-creation from RegionFactory::create(). At this point in time the region is not on any playlist. This if fine for EditorSources, but the new RegionList design only shows regions that are on the timeline. CheckNewRegion() -> EditorRegions::add_region() -> EditorRegions::regions_changed() ignores regions w/o playlist. Later Playlist::add_region_internal() sets the playlist but calls Region::clear_changes() to not send all individual changes. So Region::RegionsPropertyChanged is not emitted either. We need to notify the EditorRegions *after* setting the playlist. The downside of this is that more signals than necessary are emitted.
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