BUG #2840: \set HISTCONTROL ignoredups doesn't work in psql

The following bug has been logged online:

Bug reference:      2840
Logged by:          Ned T. Crigler
Email address:      crigler@users.sourceforge.net
PostgreSQL version: 8.2
Operating system:   Linux (Debian unstable)
Description:        \set HISTCONTROL ignoredups doesn't work in psql
Details:

In psql, doing:

\set HISTCONTROL ignoredups
select 1;
select 1;
select 1;
select 1;
select 1;

adds every select statement into the history, instead of ignoring the
duplicate statements.