(C-SPC fails ...): Add description for fcitx.

etc/ChangeLog

+2006-04-11  Kenichi Handa  <handa@m17n.org>
+
+	* PROBLEMS (C-SPC fails ...): Add description for fcitx.
+
 2006-04-10  Bill Wohler  <wohler@newt.com>
 
 	* NEWS: Add package-version keyword to `defcustom' and mention

etc/PROBLEMS

@@ -991,7 +991,7 @@ xmodmap command to the xdm setup script for that display.
 
 Use the shell command `xset bc' to make the old X Menu package work.
 
-*** C-SPC fails to work on Fedora GNU/Linux.
+*** C-SPC fails to work on Fedora GNU/Linux (or with some input method).
 
 Fedora Core 4 steals the C-SPC key by default for the `iiimx' program
 which is the input method for some languages.  It blocks Emacs users
@@ -1005,6 +1005,12 @@ Another is to specify `Emacs*useXIM: false' in your X resources.
 
 Another is to build Emacs with the `--without-xim' configure option.
 
+The same problem happens on any other system if you are using fcitx
+(Chinese input method) which by default use C-SPC for toggling.  If
+you want to use fcitx with Emacs, you have two choices.  Toggle fcitx
+by another key (e.g. C-\) by modifying ~/.fcitx/config, or be
+accustomed to use C-@ for `set-mark-command'.
+
 *** M-SPC seems to be ignored as input.
 
 See if your X server is set up to use this as a command