D24830: Add support for strikeout text in RTF documents

[Aleksandr Komakhin]

akomakhin marked an inline comment as done.

REVISION DETAIL
  https://phabricator.kde.org/D24830

To: akomakhin, pvuorela, #calligra:_3.0
Cc: Calligra-Devel-list, dcaliste, cochise, vandenoever