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Alexandru Băluț authored
When a clip is ungrouped, an empty clip is added (by GES) then a video track element is added to it. When redoing these steps in Pitivi, GES adds track elements itself because the clip has none, so we end up with too many. Added a new ClipAction undoable class to reuse the add-clip-as-is logic between ClipAdded and ClipRemoved. Reviewed-by: Thibault Saunier <tsaunier@gnome.org> Differential Revision: https://phabricator.freedesktop.org/D1583
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