One big parenthesis around a note _and_ its accidental

[Frank Steinmetzger]

Hi again

I was setting another piece yesterday and this had, as final note,
<a \parenthesis fis>1

The fis in this chord is in parenthesis (basically) like this:

-------------
       O
---/-----\---
   | # O |
---\-----/---

However, lilypond gives me this:
-------------
       O
-------------
    # (O)
-------------

The parenthesis are hardly visible, because they are half occluded by the 
accidental and because they are so small. Is there a way to achieve the style 
of my template's look?
-- 
Gruß | Greetings | Qapla'
Crayons can take you more places than starships. (Guinan)

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