Keep It Simple, Stupid.

现在的版本中， 原来的key auto-detected 变成了candidate-encodings

gsettings set org.gnome.gedit.preferences.encodings candidate-encodings "['UTF-8', 'GB18030', 'GB2312', 'GBK', 'BIG5', 'CURRENT', 'UTF-16']"

gsettings get org.gnome.gedit.preferences.encodings candidate-encodings
['UTF-8', 'GB18030', 'GB2312', 'GBK', 'BIG5', 'CURRENT', 'UTF-16']

也可以用GUI工具 dconf-editor 打开：

--EOF