Resolves: fdo#51908 drop word/char count cache when numbering rule changes
Resolves: fdo#51908 drop word/char count cache when numbering rule changes

Word Count doesn't update immediately when Numbering is applied or removed

Change-Id: I44ac2313cdeef92e6394b86316ff1037fc8d8f18

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