because "track-element" is not a valid identifier for a parameter and
will cause generated binding using GIR to be invalid. For instance in
Vala.
https://bugzilla.gnome.org/show_bug.cgi?id=765853
/**
* GESTimeline::select-tracks-for-object:
* @timeline: the #GESTimeline
- * @clip: The #GESClip on which @track-element will land
- * @track-element: The #GESTrackElement for which to choose the tracks it should land into
+ * @clip: The #GESClip on which @track_element will land
+ * @track_element: The #GESTrackElement for which to choose the tracks it should land into
*
* Returns: (transfer full) (element-type GESTrack): a #GPtrArray of #GESTrack-s where that object should be added
*/