Scroll the truncated song/artist text when long hovering over it
Summary: - When the text is truncated, we could hover over it to read the full text
Test Plan:
Everything works well
Reviewers: Plasma, VDG, ndavis, ngraham
Reviewed By: VDG, ndavis, ngraham
Subscribers: ngraham, broulik, cblack, ndavis, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D27149