diff options
Diffstat (limited to 'etc')
| -rw-r--r-- | etc/PROBLEMS | 41 |
1 files changed, 25 insertions, 16 deletions
diff --git a/etc/PROBLEMS b/etc/PROBLEMS index 1574b16a44..2a385ed631 100644 --- a/etc/PROBLEMS +++ b/etc/PROBLEMS @@ -15,30 +15,39 @@ problems with the unexec code and its interaction with libSystem.B. * Characters from the mule-unicode charsets aren't displayed under X. XFree86 4 contains many fonts in iso10646-1 encoding which have -minimal character repertoires (whereas the encoding is meant to be a -reasonable indication of the repertoire). Emacs may choose one of -these to display characters from the mule-unicode charsets and then -typically won't be able to find the glyphs to display many characters. -(Check with C-u C-x = .) To avoid this, you may need to use a fontset -which sets the font for the mule-unicode sets explicitly. E.g. to use -GNU unifont, include in the fontset spec: +minimal character repertoires (whereas the encoding part of the font +name is meant to be a reasonable indication of the repertoire +according to the XLFD spec). Emacs may choose one of these to display +characters from the mule-unicode charsets and then typically won't be +able to find the glyphs to display many characters. (Check with C-u +C-x = .) To avoid this, you may need to use a fontset which sets the +font for the mule-unicode sets explicitly. E.g. to use GNU unifont, +include in the fontset spec: mule-unicode-2500-33ff:-gnu-unifont-*-iso10646-1,\ mule-unicode-e000-ffff:-gnu-unifont-*-iso10646-1,\ mule-unicode-0100-24ff:-gnu-unifont-*-iso10646-1 -* Encoding some characters as Unicode (UTF-8/16) is rejected by Emacs. +* The UTF-8/16/7 coding systems don't encode CJK (Far Eastern) characters. -Emacs currently, by default, only supports the parts of the BMP whose -codepoints are in the ranges 0000-33ff and e000-ffff. This excludes -CJK, Yi, Music, Maths, Private Use Area, Gothic, and Old Italic. +Emacs by default only supports the parts of the Unicode BMP whose code +points are in the ranges 0000-33ff and e000-ffff. This excludes: most +of CJK, Yi and Hangul, as well as everything outside the BMP. -If you try to save a file containing characters with code points -outside this range, Emacs will suggest other compatible coding -systems. +If you read UTF-8 data with code points outside these ranges, the +characters appear in the buffer as raw bytes of the original UTF-8 +(composed into a single quasi-character) and they will be written back +correctly as UTF-8, assuming you don't break the composed sequences. +If you read such characters from UTF-16 or UTF-7 data, they are +substituted with the Unicode `replacement character', and you lose +information. -By turning Utf-Translate-Cjk mode on, many more CJK characters are -included in the support. +To edit such UTF data, turn on Utf-Translate-Cjk mode, which makes +many common CJK characters available for encoding and decoding and can +be extended by updating the tables it uses. This also allows you to +save as UTF buffers containing characters decoded by the chinese-, +japanese- and korean- coding systems, e.g. cut and pasted from +elsewhere. * Problems with file dialogs in Emacs built with Open Motif. |