[MM-63799] Fix the high number of detached nodes in post list in dynamic-virtualized-list (#30864)

e2e-tests/cypress/tests/integration/channels/collapsed_reply_threads/replies_spec.ts

@@ -71,7 +71,7 @@ describe('Collapsed Reply Threads', () => {
         cy.uiGetPostThreadFooter(rootPost.id).should('not.exist');
 
         // # Post a reply post as current user
-        cy.postMessageAs({sender: testUser, message: 'reply!', channelId: testChannel.id, rootId: rootPost.id});
+        cy.postMessageAs({sender: testUser, message: 'reply to root post', channelId: testChannel.id, rootId: rootPost.id});
 
         // # Get thread footer of last post
         cy.uiGetPostThreadFooter(rootPost.id).within(() => {

e2e-tests/cypress/tests/integration/channels/commands/leave_channel_spec.ts

@@ -27,7 +27,8 @@ describe('Leave Channel Command', () => {
     it('Should be redirected to last channel when user leaves channel with /leave command', () => {
         // # Go to newly created channel
         cy.get('#sidebarItem_' + testChannel.name).click({force: true});
-        cy.findAllByTestId('postView').should('be.visible');
+
+        cy.findAllByTestId('postView').last().scrollIntoView().should('be.visible');
 
         // # Post /leave command in center channel
         cy.postMessage('/leave ');

e2e-tests/cypress/tests/integration/channels/team_settings/teams_spec.js

@@ -139,6 +139,9 @@ describe('Teams Suite', () => {
             });
 
             cy.get('#sidebarItem_off-topic').should('be.visible').click({force: true});
+
+            cy.findAllByTestId('postView').last().scrollIntoView();
+
             cy.getLastPost().wait(TIMEOUTS.HALF_SEC).then(($el) => {
                 cy.wrap($el).get('.user-popover').
                     should('be.visible').

e2e-tests/cypress/tests/support/ui/sidebar_left.ts

@@ -139,7 +139,7 @@ Cypress.Commands.add('uiClickSidebarItem', (name) => {
         });
         cy.get('#tutorial-threads-mobile-header span.Button_label').contains('Followed threads');
     } else {
-        cy.findAllByTestId('postView').should('be.visible');
+        cy.findAllByTestId('postView').last().scrollIntoView().should('be.visible');
     }
 });