fix bug: changing video backgrounds don't properly show up in ui

src/qml/presenter/MainWindow.qml

@@ -71,11 +71,12 @@ Controls.Page {
             anchors.fill: parent
             handle: Item {
                 implicitWidth: Kirigami.Units.gridUnit / 2
+
                 Rectangle {
                     height: parent.height
                     anchors.horizontalCenter: parent.horizontalCenter
                     width: parent.width / 4
-                    color: area.containsMouse ? Kirigami.Theme.hoverColor : "#00000000"
+                    color: Qt.lighter(Kirigami.Theme.backgroundColor)
                 }
 
                 MouseArea {

src/qml/presenter/SongEditorSlideList.qml

@@ -85,6 +85,14 @@ Item {
             function playPauseVideo() {
                 representation.playPauseVideo();
             }
+
+            Connections {
+                target: songEditorModel
+                function onBackgroundChanged() {
+                    console.log("BG CHANGED: Load video or clear it");
+                    representation.loadVideo();
+                }
+            }
         }
 
         Kirigami.WheelHandler {