In some cases when rippling clip we could get the algo lost because
a transition existed between two clips (for example at the end of c1
and at the begining of c2) but while rippling it would have required
a transition at the end of c2 and beginning of c1, and we were properly
not destroying the old one (as the two clips were in the moving context)
but we were still creating the other transition in the end...
Reviewed-by: Alex Băluț <alexandru.balut@gmail.com>
Differential Revision: https://phabricator.freedesktop.org/D1362
Had to separate timeline_emit_group_added from timeline_add_group
to avoid emitting group-added when the project is being loaded.
Reviewed-by: Thibault Saunier <thibault.saunier@collabora.com>
Differential Revision: https://phabricator.freedesktop.org/D1302
