private void EnsureStubCompletionBroker()
{
if (_completionBroker != null)
{
return;
}
var textBuffer = _wpfTextView.TextBuffer;
var completionSource = new DeveroomCompletionSource(
textBuffer,
new StubBufferTagAggregatorFactoryService(_ideScope).CreateTagAggregator <DeveroomTag>(textBuffer),
_ideScope);
_completionBroker = new StubCompletionBroker(completionSource);
}