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GESTimelineElement has some collisions between virtual methods and invokers

Submitted by Corentin Noël @tintou

Link to original bug (#796490)

Description

To make Vala happy, the invoker and virtual functions have to have to same prototype.
Here for GESTimelineElement, a possible approach would be to add a gboolean as return type of the invokers

The virtual methods:

  gboolean (*set_start)        (GESTimelineElement * self, GstClockTime start);  
  gboolean (*set_inpoint)      (GESTimelineElement * self, GstClockTime inpoint);  
  gboolean (*set_duration)     (GESTimelineElement * self, GstClockTime duration);  
  gboolean (*set_max_duration) (GESTimelineElement * self, GstClockTime maxduration);  
  gboolean (*set_priority)     (GESTimelineElement * self, guint32 priority);

The invokers:

GES_API  
void ges_timeline_element_set_start                  (GESTimelineElement *self, GstClockTime start);  
GES_API  
void ges_timeline_element_set_inpoint                (GESTimelineElement *self, GstClockTime inpoint);  
GES_API  
void ges_timeline_element_set_duration               (GESTimelineElement *self, GstClockTime duration);  
GES_API  
void ges_timeline_element_set_max_duration           (GESTimelineElement *self, GstClockTime maxduration);  
GES_API  
void ges_timeline_element_set_priority               (GESTimelineElement *self, guint32 priority);