[Kicker] Fix "Tooltip can not be displayed"
Summary:
Display the tooltip with the full label for truncated items
BUG: 390804
Test Plan:
- Tooltip can be display when hovering the mouse on truncated items.
- Other behaviors work normally.
Reviewers: ngraham, hein, Plasma, broulik
Reviewed By: ngraham, hein, Plasma
Subscribers: abetts, ndavis, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D19096