Feature request: `ExtendedAutoIndentChars`

[liangjiancang]

Notepad 3 currently only supports auto indent for characters at the beginning of a line with U+0009 and U+0020 (right?), but I would like to include other characters for auto indent, such as U+3000 (Ideographic Space).

For example (　 is U+3000):

ABCD
　　EFGH[cursor]

Enter↓

ABCD
　　EFGH
　　[cursor]