Multiple providers can be registered for a language. In that case providers are sorted
by their score and groups of equal score are sequentially asked for
completion items. The process stops when one or many providers of a group return a
result. A failing provider (rejected promise or exception) will not fail the whole
operation.
Register a completion provider.
Multiple providers can be registered for a language. In that case providers are sorted by their score and groups of equal score are sequentially asked for completion items. The process stops when one or many providers of a group return a result. A failing provider (rejected promise or exception) will not fail the whole operation.