wallpapers/slideshowpackage: fix tooltip so it actually appears

We had disabled hover on the list item, so it would never become
visible. In addition, its visibility condition was wrong as we only want
it to become visible for list items that have elided text.

BUG: 459052
FIXED-IN: 5.26

wallpapers/image/slideshowpackage/contents/ui/SlideshowComponent.qml

@@ -191,8 +191,11 @@ ColumnLayout {
                     hoverEnabled: false
                     contentItem: Kirigami.BasicListItem {
                         width: slidePathsView.width - baseListItem.overlayWidth
-                        // Don't need a highlight or hover effects
-                        hoverEnabled: false
+                        // Don't want a background highlight effect, but we can't just
+                        // set hoverEnabled to false, since then the tooltip will
+                        // never appear!
+                        activeBackgroundColor: "transparent"
+                        activeTextColor: Kirigami.Theme.textColor
                         separatorVisible: false
 
                         // Header: the folder
@@ -207,7 +210,7 @@ ColumnLayout {
                         }
 
                         QQC2.ToolTip.text: modelData
-                        QQC2.ToolTip.visible: hovered
+                        QQC2.ToolTip.visible: hovered && (labelItem.truncated || subtitleItem.truncated)
                         QQC2.ToolTip.delay: Kirigami.Units.toolTipDelay
                     }