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When you hit a right paren, the cursor should move briefly to the left
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The supported styles are:

default -- When a right paren is typed, highlight the matching
        left paren for 1/2 sec.

expression -- When a right paren is typed, highlight the entire
        expression from the left paren to the right paren.

TODO:
        - extend IDLE with configuration dialog to change options
        - implement rest of Emacs highlight styles (see below)
        - print mismatch warning in IDLE status window

Note: In Emacs, there are several styles of highlight where the
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