Function sourceview5_sys::gtk_source_completion_provider_display

pub unsafe extern "C" fn gtk_source_completion_provider_display(
    self_: *mut GtkSourceCompletionProvider, 
    context: *mut GtkSourceCompletionContext, 
    proposal: *mut GtkSourceCompletionProposal, 
    cell: *mut GtkSourceCompletionCell
)

This is supported on crate feature v5_0 only.