Thanks! Most of the time it works well, but I don't know why changing the selection more to the beginning or end of a line at start of a selection that comprises 2 paragraphs, results is varying, sometimes correct, sometimes total-1 (incorrect lines number by 1).
Few times, selecting the last characters of the 1st line (less +-10 character) through part of the 2nd line return just 1 line in selection, not 2.

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Backup your original file before doing any modification.