add or customize more 'space' characters in code folding

[roj234]

text file(and probably other files)'s "code" fold seems only support space and tab (without U+3000) maybe you can add a config entry in notepad2.ini thank you

[zufuliu]

full-width (Unicode) space is not supported by any lexer, you can use "Fullwidth Form to Halfwidth" menu to convert it into ASCII space U+0020.