gnome-control-center will take ENTER key event away, causes imput method users can't commit preedit string to the textbox(search bar).

currently reproduced input method : HIME
HIME upstream bug tracker page : https://github.com/caleb-/hime/issues/347

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnome-control-center 1:3.4.1-0ubuntu1
Uname: Linux 3.3.3-intelcore2optimized-vdragon-mod i686
ApportVersion: 2.0.1-0ubuntu6
Architecture: i386
Date: Fri Apr 27 19:53:58 2012
ExecutablePath: /usr/bin/gnome-control-center
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
ProcEnviron:
 LANGUAGE=zh_TW:zh
 PATH=(custom, no user)
 LANG=zh_TW.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-control-center
UpgradeStatus: No upgrade log present (probably fresh install)
XsessionErrors:
 (hime:1542): GLib-WARNING **: In call to g_spawn_sync(), exit status of a child process was requested but SIGCHLD action was set to SIG_IGN and ECHILD was received by waitpid(), so exit status can't be returned. This is a bug in the program calling g_spawn_sync(); either don't request the exit status, or don't set the SIGCHLD action.
 (compiz:1739): GConf-CRITICAL **: gconf_client_add_dir: assertion `gconf_valid_key (dirname, NULL)' failed
 (gnome-control-center:2547): background-cc-panel-WARNING **: Could not load /usr/share/themes/Adwaita/index.theme: 沒有此一檔案或目錄
usr_lib_gnome-control-center:
 activity-log-manager-control-center 0.9.4-0ubuntu3
 deja-dup 22.0-0ubuntu2
 gnome-bluetooth 3.2.2-0ubuntu5
 indicator-datetime 0.3.94-0ubuntu2