Force drawer to open to channel menu when new teams are added (#3269)

app/components/sidebars/main/drawer_swipper/drawer_swiper.js

@@ -52,6 +52,12 @@ export default class DrawerSwiper extends Component {
         }
     };
 
+    scrollToInitial = () => {
+        if (this.swiperRef?.current) {
+            this.swiperRef.current.scrollToInitial();
+        }
+    }
+
     swiperPageSelected = (index) => {
         this.props.onPageSelected(index);
     };

app/components/sidebars/main/main_sidebar.js

@@ -338,6 +338,7 @@ export default class ChannelSidebar extends Component {
         if (this.drawerSwiper) {
             if (multipleTeams) {
                 this.drawerSwiper.runOnLayout();
+                this.drawerSwiper.scrollToInitial();
             } else if (!openDrawerOffset) {
                 this.drawerSwiper.scrollToStart();
             }

app/components/swiper.js

@@ -107,6 +107,14 @@ export default class Swiper extends PureComponent {
         });
     };
 
+    scrollToInitial = () => {
+        setTimeout(() => {
+            if (this.scrollView) {
+                this.scrollView.scrollTo({x: this.props.width * this.props.initialPage, animated: false});
+            }
+        }, 0);
+    };
+
     refScrollView = (view) => {
         this.scrollView = view;
     };