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* - a null string if @p rect is a valid pointer to a null area
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* - the whole page text if @p rect is a null pointer
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* - the text which is included by rectangular area @p rect otherwise
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QString text( const RegularAreaRect *rect = 0 ) const;
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* Returns the rectangular area of the given @p selection.
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RegularAreaRect *textArea( TextSelection *selection ) const;