Fix clip cannot be moved to 0 on some zoom level when another snap point was close to 0

src/timeline2/model/timelinemodel.cpp

@@ -130,6 +130,7 @@ TimelineModel::TimelineModel(Mlt::Profile *profile, std::weak_ptr<DocUndoStack>
     m_blackClip->set("set.test_audio", 0);
     m_blackClip->set_in_and_out(0, TimelineModel::seekDuration);
     m_tractor->insert_track(*m_blackClip, 0);
+    m_snaps->addPoint(0);
 
     TRACE_CONSTR(this);
 }