Please describe the problem:
In zh_CN.UTF-8 locale, the "Quan Jiao" quotation mark(which is two characters wide) will overlap with the next character, whether it's chinese character or not. I can only show you the picture: http://static.flickr.com/77/223548966_dbdc35cfda_o.png，as a comparison, there's no such problem with zh_CN.GBK locale: http://static.flickr.com/64/223548967_66cda03c7e_o.png. and there're no such problems for rxvt-unicode(but gnome-terminal/vte is much much more prittier than rxvt-unicode, so I hope g-t will improve in this tiny problem :) either in zh_CN.UTF-8 locale: http://static.flickr.com/58/223548968_2919aff0d4_o.png, or in zh_CN.GBK locale: http://static.flickr.com/85/223548969_ca7b09a9fb_o.png. I've not tried other locale(zh_TW.UTF-8 for example)

Steps to reproduce:
1. open gnome-terminal in zh_CN.UTF-8 locale
2. use any chinese input method(scim/fcitx for instance) to input "Quan Jiao" quotation mark
3. there's the poblem


Actual results:
quotation mark overlap with the next character

Expected results:
in UTF-8, I hope it will display like rxvt-unicode in UTF-8 locale

Does this happen every time?
yes

Other information:
I do not have too much knowledge about the details of coding related stuff like UCS/UTF-8/GBK, but in rxvt-unicode and UTF-8, quotation mark displayed like a "Ban Jiao"(one western character's wide) character, but in g-t, it seems the glyph(font?) itself is a "Quan Jiao"(two characters wide) character, but g-t attempts to display it like an "Ban Jiao"(one western character's wide), so it ovlap with the next character.