kgpg fails to encrypt file whose path contains non-ascii characters

Binary package hint: kgpg

when trying to encrypt a file from Dolphin context menu, if there are Chinese
characters in the path(e.g.: /home/user/文档/test.txt), the encryption will fail
with the following popup error message:

Process halted.
Not all files were encrypted.

I reported the same bug(https://bugs.kde.org/show_bug.cgi?id=201070) against kgpg 2.1.0(KDE 4.2.4) back in Jul 2009. I was told the bug was fixed, however the fact is it is still there in kgpg 2.2.2(KDE 4.3.4).

ProblemType: Bug
Architecture: i386
Date: Thu Jan 14 15:05:06 2010
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/kgpg
InstallationMedia: Kubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
Package: kgpg 4:4.3.4-0ubuntu1~karmic1
ProcEnviron:
 LANGUAGE=zh_CN:zh
 PATH=(custom, user)
 LANG=zh_CN.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-18.55+tuxonice1-core2
SourcePackage: kdeutils
Uname: Linux 2.6.31-18-core2 i686
XsessionErrors:
 (nautilus:2238): Eel-CRITICAL **: eel_preferences_get_boolean: assertion `preferences_is_initialized ()' failed
 (polkit-gnome-authentication-agent-1:2391): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (firefox:6438): GLib-WARNING **: g_set_prgname() called multiple times
 (thunderbird-bin:6457): GLib-WARNING **: g_set_prgname() called multiple times