* lisp/paren.el: Simplify the code.
(show-paren-mode): Always start the timer. (show-paren--idle-timer): Rename from show-paren-idle-timer. (show-paren--overlay, show-paren--overlay-1): Rename from show-paren-overlay and show-paren-overlay-1, and initialize to an overlay rather than to nil. (show-paren-function): Misc cleanup and simplifications.
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