Summary:
Right now ExpandableListItem is not very touch-friendly due to use of a mousearea
hover effect for choosing the selected item. This patch fixes that by using a `TapHandler`
to handle left-clicks and touch input. We still need a MouseArea inside it to handle
non-touch hover and right-click behaviors.
FEATURE: 393749
FIXED-IN: 5.70
Test Plan: Click behavior is identical to how it was before, but now touch works too: {F8234452}
Reviewers: #plasma, apol, #vdg, niccolove
Subscribers: kde-frameworks-devel
Tags: #frameworks
Differential Revision: https://phabricator.kde.org/D28808
52c0a136f9