D9797: [Task Manager] Let mouse back/forward keys switch tracks

[Eike Hein]

hein accepted this revision.

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D9797

To: broulik, #plasma, hein, mart
Cc: mart, plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, 
jensreuterberg, abetts, sebas, apol