racket/gui: add doc cross-reference
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@ -289,7 +289,8 @@ Called when the user changes one of the canvas's scrollbars. A
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scroll action.
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This method is called only when manual
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scrollbars are changed, not automatic scrollbars; for automatic scrollbars,
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scrollbars are changed (see @method[canvas% init-manual-scrollbars]),
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not automatic scrollbars; for automatic scrollbars,
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the
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@method[canvas<%> on-paint] method is called, instead.
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