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ucs method on non-supported unicode chars

From: Juanma Barranquero
Subject: ucs method on non-supported unicode chars
Date: Mon, 18 Dec 2006 12:21:24 +0100

With function `ucs-insert' (from lisp/international/ucs-tables.el):

 M-x ucs-insert RET 4DF9 RET => "Character U+4DF9 is not yet
supported" (an error message).

With ucs input method:

 U4DF9 => "ä·¹" (in the buffer).

Why does the ucs input method try to insert what it knows is an
unsupported character? In which way it is better to get "ä·¹" than a
helpful error message?

I ask because the behavior is clearly intentional. `utf-8-ccl-encode'
is defined in leim/quail/uni-input.el, and `ucs-input-method' includes
this error handling:

(if c
   (list c)
 (aset status 0 n)
 (string-to-list (ccl-execute-on-string
                  'utf-8-ccl-encode status "")))


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