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

@@ -1140,13 +1140,17 @@ export const DockDash = GObject.registerClass({
  * @param actor
  */
 function ensureActorVisibleInScrollView(scrollView, actor) {
-    const {adjustment: vAdjustment} = scrollView.vscroll;
-    const {adjustment: hAdjustment} = scrollView.hscroll;
+    // access to scrollView.[hv]scroll was deprecated in gnome 46
+    // instead, adjustment can be accessed directly
+    // keep old way for backwards compatibility (gnome <= 45)
+    const vAdjustment = scrollView.vadjustment ?? scrollView.vscroll.adjustment;
+    const hAdjustment = scrollView.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];
     let vOffset = 0;
     let hOffset = 0;
+
     const fade = scrollView.get_effect('fade');
     if (fade) {
         vOffset = fade.fade_margins.top;