9bfe404b4e
Issue #6280 states that when selecting ranges using SnapToRegionBoundary it's not possible to select regions with first_frame() == 0. This is because Playlist::find_next_region() does not consider region boundaries == pos but only > pos. Thus it never considers pos == 0 to be a region boundary. This solution tries to be as little invasive as possible without changing the semantics of PlayList::find_next_region(). Therefore position 0 is added to the region boundary cache if there's a region starting at position 0 in any track.
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