fdo#47434: Zero rect. size causing wrong line positions.
fdo#47434: Zero rect. size causing wrong line positions.

Thanks to Korrawit Pruegsanusak <detective.conan.1412@gmail.com>
for the indepth analysis and debugging.

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core