applets/notifications: Pass wheel events of TextArea to ListView
requested to merge work/fusionfuture/notification-fix-popup-size-when-resizing-panel-smaller into master
Prevent TextArea in SelectableLabel from accepting wheel
events when the notification item is in FullRepresentation,
and pass wheel events to ListView in FullRepresentation when the
cursor is over the TextArea.
BUG: 443840 FIXED-IN: 5.24
Invert scrolling direction is also tested.
Edited by Fushan Wen