controlpanel: maintain proper size

modules/controlcenter/audio/AudioPane.qml

@@ -228,10 +228,27 @@ RowLayout {
         Layout.fillWidth: true
         Layout.fillHeight: true
 
-        ColumnLayout {
+        StyledFlickable {
+            id: rightFlickable
+
             anchors.fill: parent
             anchors.margins: Appearance.padding.large * 2
 
+            flickableDirection: Flickable.VerticalFlick
+            contentHeight: contentLayout.implicitHeight
+            clip: true
+
+            StyledScrollBar.vertical: StyledScrollBar {
+                flickable: rightFlickable
+            }
+
+            ColumnLayout {
+                id: contentLayout
+
+                anchors.left: parent.left
+                anchors.right: parent.right
+                anchors.top: parent.top
+
                 spacing: Appearance.spacing.normal
 
             MaterialIcon {
@@ -370,6 +387,7 @@ RowLayout {
                 onMoved: Audio.setSourceVolume(value)
             }
         }
+        }
 
         InnerBorder {
             leftThickness: Appearance.padding.normal / 2