D25664: [WIP]: Port away from deprecated QSignalMapper

[Carl Schwan]

ognarb marked 3 inline comments as done.

REPOSITORY
  R8 Calligra

REVISION DETAIL
  https://phabricator.kde.org/D25664

To: ognarb, #calligra:_3.0, #kf6, dfaure
Cc: danders, dfaure, Calligra-Devel-list, davidllewellynjones, dcaliste, ognarb, cochise, vandenoever
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