D9979: [Notifications] Disable history check box when notifications are disabled

[Kai Uwe Broulik]

broulik edited the summary of this revision.

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D9979

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