D15249: Use lambdas instead of QSignalMapper

[Anthony Fieroni]

anthonyfieroni added a reviewer: elvisangelaccio.

REPOSITORY
  R36 Ark

REVISION DETAIL
  https://phabricator.kde.org/D15249

To: volkov, #ark, elvisangelaccio
Cc: anthonyfieroni, kde-utils-devel, #ark, tctara
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