[ExpandableListItem] Make colored text 100% opaque
requested to merge ngraham/plasma-framework:make-expandableListItem-colored-text-totally-opaque into master
Otherwise it can be difficult to see, especially with dark backgrounds. Also, let's set the opacity directly rather than using the enabled property to approximate it.
BUG: 427171 FIXED-IN: 5.76
cc @ndavis