search-again

Searches for the text in the search edit in the result of get-text-to-search.

• (send a-frame:searchable search-again direction beep?) -> boolean
      direction = previous searching direction : 'forward or 'backward
      beep? = #t : bool

  Returns #t if the text is found and sets the selection to the found text. If the text is not found it returns #f.