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Thibault Saunier authored
This method can be used for subclass to override the default behaviour for child lookup. This vmethod can be used for example in the case where you want the name of a child property to be 'overridden'. As an example in the GESTitleSource where we have a videotestsrc which has a 'foreground-color' property that is used in the TitleSource to set the background color of the title, this vmethod is now used to tweak the name passed as parameter to rename "background" to "foreground-backend" making our API understandable. API: GESTrackElement::lookup_child https://bugzilla.gnome.org/show_bug.cgi?id=727880
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