scroll: use wheelpropagation. Ref #10772

Once the vertical scrollbar comes to its end position, it should
allow the page scroll bar to start scrolling.

public/app/core/components/ScrollBar/ScrollBar.tsx

@@ -7,7 +7,6 @@ export interface Props {
 }
 
 export default class ScrollBar extends React.Component<Props, any> {
-
   private container: any;
   private ps: PerfectScrollbar;
 
@@ -16,7 +15,9 @@ export default class ScrollBar extends React.Component<Props, any> {
   }
 
   componentDidMount() {
-    this.ps = new PerfectScrollbar(this.container);
+    this.ps = new PerfectScrollbar(this.container, {
+      wheelPropagation: true,
+    });
   }
 
   componentDidUpdate() {

public/app/core/components/scroll/scroll.ts

@@ -6,7 +6,9 @@ export function geminiScrollbar() {
   return {
     restrict: 'A',
     link: function(scope, elem, attrs) {
-      let scrollbar = new PerfectScrollbar(elem[0]);
+      let scrollbar = new PerfectScrollbar(elem[0], {
+        wheelPropagation: true,
+      });
       let lastPos = 0;
 
       appEvents.on(