filterText 
  A text that is used to decide if this inline completion should be shown. When falsy the InlineCompletionItem.insertText is used.
An inline completion is shown if the text to replace is a prefix of the filter text.
A text that is used to decide if this inline completion should be shown. When falsy the InlineCompletionItem.insertText is used.
An inline completion is shown if the text to replace is a prefix of the filter text.