When duration or inpoint change, we need to remove edge control points,
and set new control points with interpolated values.
Also when duration == 0, we need to remove all control points, as otherwise
the controller will raise !is_end assertions.
It's the duty of the application to set keyframes back when duration gets
!= 0 again.
We should make sure that the newly created trackelement are inside
a container when adding them to as this is needed for GESUriClip-s.
Also do not try to set a child property on the TrackElement itself.
https://bugzilla.gnome.org/show_bug.cgi?id=703152
The GNL API changed to go from a model where user could
enable/disable updates in the composition, which leaded to races
in many places, to a model where any positioning change in the
composition is not directly done but 'cached' and then the user
has to commit those changes so they become effective in the media
processing stack.
The new API in GES is pretty similare and is basically copy
pasting this new design.
We still need to see if in some context it would make sense to add
a mode where we would commit any changes ourself at the end of our
operation for basic use cases.
Removed APIs:
ges_timeline_enable_update
ges_timeline_is_updating
ges_track_enable_update
ges_track_is_updating
New APIs:
ges_track_commit
ges_timeline_commit
Remove APIs:
ges_track_element_set_locked
ges_track_element_is_locked
Those APIs where really not nice to use and were causing more issues
than solving them. If 2 time related properties of TimelineElement must
be different, then those element can *not* have the same parent.
Plus, with the new ges_container_group () API, we will recreate 1
GESClip containing the proper GESTimelineElements if it is the thing
to do.
... Not the other way round.
+ Add and enhance debugging info on the way
The user should not be responsible for removing the GESTrackElements from
GESTracks, instead, removing it from a GESClip should imply removing
it from any GESTrack it is in.
This patch changes sensibly the behaviour when we remove a
GESTrackElement from a GESTrack, not remoing it from the GESClip it is
in. *But*, users should never remove a GESTrackElement from a GESTrack
anyway. The testsuite has been updated to that new behaviour.
