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FIRST is a composite character, decompose it at first.

change, use generate-new-buffer instead of get-buffer-create.

they used to do some other jobs than what done by
set-language-environment, those jobs are done in
setup-XXX-environment-internal now.

call set-language-environment-coding-systems.

the length of converted region.

a code setting default value of default-input-method.

change sendmail-coding-system and rmail-file-coding-system.

coding system names.  Set default-input-method to "tibetan-wylie".

language/XXX-util.  Delete local variable declartion.
Delete the code of calling register-input-method form
all files under this directory.

moved form LANGUAGE.el to LANG-util.el.  These functions now at
first call setup-english-environment to reset various values to
the defaults.

for the case the arg FROM is a string.