making header of list above the list as it flows upward

src/qml/presenter/Library.qml

@@ -110,9 +110,15 @@ Item {
                 }
 
                 header: Component {
-                    Kirigami.ActionToolBar {
+                    Rectangle {
+                        id: songLibraryHeader
+                        z: 2
                         height: 40
                         width: parent.width
+                        color: Kirigami.Theme.backgroundColor
+                        Kirigami.ActionToolBar {
+                            height: parent.height
+                            width: parent.width
                             display: Controls.Button.IconOnly
                             visible: selectedLibrary == "songs"
                             actions: [
@@ -145,6 +151,7 @@ Item {
                             }
                         }
                     }
+                }
 
                 headerPositioning: ListView.OverlayHeader