Completion of ENV variables seems to be broken - leading slash (or even more) is added

[Rafał Lalik]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: x86_64-pc-linux-gnu-gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu'
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash'
-DSHELL -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib
-DDEFAULT_PATH_VALUE='/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'
-DSTANDARD_UTILS_PATH='/bin:/usr/bin:/sbin:/usr/sbin'
-DSYS_BASHRC='/etc/bash/bashrc'
-DSYS_BASH_LOGOUT='/etc/bash/bash_logout'
-DNON_INTERACTIVE_LOGIN_SHELLS -DSSH_SOURCE_BASHRC -march=core2 -O2
-pipe
uname output: Linux dlnbp019 2.6.37-gentoo-r2 #1 SMP PREEMPT Sat Mar
12 08:59:11 CET 2011 x86_64 Intel(R) Core(TM)2 Duo CPU T7500 @ 2.20GHz
GenuineIntel GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 4.2
Patch Level: 7
Release Status: release

Description:
        When enter in console "ls $HOME/" and press TAB for
completion, then bash add slash for special characters like $ { }
        When I back to wersion 4.1_p10 then problem is gone. Problem
also exists with 4.2_p6 and 4.2_p1 (these veriosn I have checked).

Repeat-By:
        1/ type: ls $HOME
        2/ press TAB
        3/ Should get: ls \$HOME
        4/ Try the same with ${HOME}
        5/ Should get \$\{HOME\}