fix deprecated "St.ScrollView.[hv]scroll" property

only used to access adjustments, which can be directly accessed now.

see: https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3020

dash.js

@@ -1140,8 +1140,15 @@ export const DockDash = GObject.registerClass({
  * @param actor
  */
 function ensureActorVisibleInScrollView(scrollView, actor) {
-    const {adjustment: vAdjustment} = scrollView.vscroll;
-    const {adjustment: hAdjustment} = scrollView.hscroll;
+    let vAdjustment = scrollView.vadjustment
+    let hAdjustment = scrollView.hadjustment
+    if (vAdjustment === undefined || hAdjustment === undefined) {
+      // access to scrollView.[hv]scroll was deprecated in gnome 46
+      // backwards compatibility for gnome <46
+      vAdjustment = scrollView.vscroll.adjustment
+      hAdjustment = scrollView.hscroll.adjustment
+    }
+
     const {value: vValue0, pageSize: vPageSize, upper: vUpper} = vAdjustment;
     const {value: hValue0, pageSize: hPageSize, upper: hUpper} = hAdjustment;
     let [hValue, vValue] = [hValue0, vValue0];