PlasmaComponents.ListView already provides onClicked and containsMouse

It does not provide onEntered/onExited but we can mimic that with onContainsMouseChanged
This removes the MouseArea which could never occupy the entire highlight area due to theme
margins leading to annoying flickering when moving between items because the one MouseArea
was exited before the next one was entered

applets/clipboard/contents/ui/ClipboardItemDelegate.qml

@@ -38,14 +38,16 @@ PlasmaComponents.ListItem {
 
     x: -listMargins.left
 
-    MouseArea {
-        anchors.fill: parent
-        hoverEnabled: true
+    enabled: true
 
     onClicked: menuItem.itemSelected(UuidRole)
-
-        onEntered: menuListView.currentIndex = index
-        onExited: menuListView.currentIndex = -1
+    onContainsMouseChanged: {
+        if (containsMouse) {
+            menuListView.currentIndex = index
+        } else {
+            menuListView.currentIndex = -1
+        }
+    }
 
     Item {
         id: label
@@ -217,4 +219,3 @@ PlasmaComponents.ListItem {
         }
     }
 }
-}