Function create_references_view 

pub fn create_references_view(
    activator: &mut dyn ModeActivator,
    locations: &[Location],
    origin: ReferencesOrigin,
    registry: CommandRegistryHandle,
    lang_registry: Option<Arc<LangRegistry>>,
) -> Option<BufferId>

Open a references multibuffer over locations.

Returns the view’s BufferId, or None when there is nothing to show — the caller echoes rather than opening an empty view.

origin is stored per-view so gr re-queries the symbol the search started from, not whatever the multibuffer cursor later lands on.