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From Bugzilla Helper: User-Agent: Mozilla/4.76 [en] (X11; U; Linux 2.2.17-14 i686) Xemacs refuses to run -unibyte, i.e. without MULE. Also eval'ing (standard-display-european) doesn't switch mule. MULE has broken upper/lower case folding and should be disabled for European languages. Reproducible: Always Steps to Reproduce: [these are actually 3 different effects, the don't have to be made step-by-step.] 1. Run: xemacs -unibyte # It still has MULE it menu-bar, 2. While in xemacs. Eval (standard-display-european), the mule is still there. 3. Enter quail mode and try to enter accented character, make it into region and try C-x C-u or C-x C-l, nothing happens to accented although it correctly changes latin characters. Expected Results: In GNU emacs, or in previous releases of xemacs from Redhat step 1 or step 2 runs emacs without MULE. Also GNU emacs correctly changes the case of any character Actually the MULE in Xemacs is broken and I don't think Redhat can make anything with this case except waiting till Xemacs group fixes it. This bug is even documented. Try looking at information on function set-case-table, there's a remark: BUG: Under XEmacs/Mule, translations to or from non-ASCII characters (this includes chars in the range 128 - 255) are ignored by the string/buffer-searching routines. Thus, `case-fold-search' will not correctly conflate a-umlaut and A-umlaut even if the case tables call for this. I think a non-mule version should be also provided, because otherwise I can't edit ISO-8859-2 files (I'm Polish). Thanks to .src.rpm I can easily produce an xemacs version just by setting --with-mule=no in configure part.
"-unibyte" is not a documented startup option (at least, I can't find it with --help or in the man page), so I'm not terribly surprised it doesn't work. "NOTABUG". As for problems with case, I suggest you report it with M-x report-emacs-bug - this issue isn't listed in PROBLEMS. "WONTFIX" - this is better left to the xemacs maintainers.
I don't agree that I should report it via emacs-bug. Xemacs maintainers are already aware of this bug and they're working on it. It is documented. Try (describe-function 'set-case-table). Meanwhile the MULE works incorrectly for european languages with diacritics, i.e. for virtually every non-english latin based language.
Sorry, I forgot to reopen the bug, I left it as WONTFIX. See my previous comment.
WONTFIX, as the mule issues is an architectural issue. FTR, in works in Emacs.