def would_merge? filename
      return true if directory == '*' || source_hash.include?(filename)
      @config = Solargraph::Workspace::Config.new(directory)
      config.calculated.include?(filename)
    end
def would_merge? filename
      return true if directory == '*' || source_hash.include?(filename)
      @config = Solargraph::Workspace::Config.new(directory)
      config.calculated.include?(filename)
    end
Determine whether a file would be merged into the workspace.

 @param filename [String]
 @return [Boolean]