BUG #3237: function to_char() returns wrong value

The following bug has been logged online:

Bug reference: 3237
Logged by: Robert wang
Email address: robert(dot)wang(at)eitec(dot)com(dot)tw
PostgreSQL version: 8.2
Operating system: Windows 2000 professional
Description: function to_char() returns wrong value
Details:

I run this following SQL command in pgAdminIII:

Select to_char(12345,'00000')

but it always returns ' 12345' (hex code: 20 31 32 33 34 35).It always adds
one space char in the left side.

I have to use another function substring() as followings to get my expected
value.

Select substring(to_char(12345,'00000'),from ' ' for 5)

it exactly returns '12345' which I expect.