Variable: previous-transient-input-method
previous-transient-input-method is a buffer-local variable defined in
mule-cmds.el.gz.
Documentation
The input method that was active before enabling the transient input method.
If nil, that means no previous input method was active.
Source Code
;; Defined in /usr/src/emacs/lisp/international/mule-cmds.el.gz
(defvar-local previous-transient-input-method nil
"The input method that was active before enabling the transient input method.
If nil, that means no previous input method was active.")