BUG #4752: sourceline in pg_settings indicates wrong number

The following bug has been logged online:

Bug reference: 4752
Logged by: Fujii Masao
Email address: masao(dot)fujii(at)gmail(dot)com
PostgreSQL version: PostgreSQL 8.4d
Operating system: Red Hat Enterprise Linux Server release 5.1 (Tikanga)
Description: sourceline in pg_settings indicates wrong number
Details:

Hi,

sourceline (in pg_settings) of the parameter line without '\n' indicates
wrong number as follows.

$ nl $PGDATA/postgresql.conf
1 shared_buffers = 32MB <-- this line doesn't contain '\n'
$ psql -c "SELECT sourceline FROM pg_settings WHERE name =
'shared_buffers'"
sourceline
------------
0
(1 row)

On the other hand, if the line has '\n', sourceline indicates the correct
number.

$ echo "shared_buffers = 32MB" > $PGDATA/postgresql.conf
$ nl $PGDATA/postgresql.conf
1 shared_buffers = 32MB <-- this line contains '\n'
$ psql -c "SELECT sourceline FROM pg_settings WHERE name =
'shared_buffers'"
sourceline
------------
1
(1 row)

Is this bug?