Patch: reducing amount of duplicate code

Hey.

Here's a patch for reducing code duplication. Not tested - needs review.

Also (prior to the patch) in OnCaretLeft() and OnCaretRight() first follows EnsureCaretVisible(), then UpdateCaret(), and in OnCaretUp() and OnCaretDown() the above two calls are in reverse order. Is this reverse order ever needed? If not, onCaretWordLeftRight() method could be renamed into onCaretMove() and further reused.

Best wishes.
Dmitry.

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