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VisiblePosition previousLinePosition(const VisiblePosition &, int x);
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VisiblePosition nextLinePosition(const VisiblePosition &, int x);
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bool inSameLine(const VisiblePosition &, const VisiblePosition &);
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bool isStartOfLine(const VisiblePosition &);
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bool isEndOfLine(const VisiblePosition &);
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// paragraphs (perhaps a misnomer, can be divided by line break elements)
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VisiblePosition startOfParagraph(const VisiblePosition&);