Base:
method
ShouldTriggerCompletion
Microsoft.CodeAnalysis.Completion.CommonCompletionProvider.ShouldTriggerCompletion(Microsoft.CodeAnalysis.Host.LanguageServices, Microsoft.CodeAnalysis.Text.SourceText, System.Int32, Microsoft.CodeAnalysis.Completion.CompletionTrigger, Microsoft.CodeAnalysis.Completion.CompletionOptions, Microsoft.CodeAnalysis.Options.OptionSet)