fix(react-router): symmetric pathname+search url comparison

The leavingUrl/currentUrl comparison in handleHistoryChange used
`leavingLocationInfo.pathname + leavingLocationInfo.search` on the
left side but `location.pathname` (no search) on the right. For any
route with a non-empty search string, the comparison was always
unequal, so the transition block ran on every history event —
including no-op popstates over same-URL entries (e.g. pushed via
window.history.pushState). That triggered a false POP transition
to the previous route while the browser URL stayed put.

Compares pathname+search on both sides so the block runs only when
the URL actually changed. Verified with a new Cypress regression
that pushes a same-URL state on a search-bearing route, calls
history.back(), and asserts the page does not teleport.

Author: EricHech

packages/react-router/src/ReactRouter/IonRouter.tsx

@@ -107,7 +107,8 @@ class IonRouterInner extends React.PureComponent<IonRouteProps, IonRouteState> {
     }
 
     const leavingUrl = leavingLocationInfo.pathname + leavingLocationInfo.search;
-    if (leavingUrl !== location.pathname) {
+    const currentUrl = location.pathname + (location.search || '');
+    if (leavingUrl !== currentUrl) {
       if (!this.incomingRouteParams) {
         if (action === 'REPLACE') {
           this.incomingRouteParams = {

packages/react-router/test/base/tests/e2e/specs/routing.cy.js

@@ -344,6 +344,25 @@ describe('Routing Tests', () => {
     cy.get('div.ion-page[data-pageid=home-details-page-1] [data-testid="details-input"]').should('have.value', '1');
   });
 
+  it('Details 1 with Query Params > pop a same-URL history entry, should stay on details 1', () => {
+    // Regression: popstate over a same-URL entry on a search-bearing route used to trigger a false POP transition.
+    cy.visit(`http://localhost:${port}/routing`);
+    cy.ionNav('ion-item', 'Details 1 with Query Params');
+    cy.ionPageVisible('home-details-page-1');
+    cy.location('search').should('eq', '?hello=there');
+
+    cy.window().then((win) => {
+      win.history.pushState({ marker: true }, '', win.location.href);
+    });
+
+    cy.go('back');
+
+    // No teleport: still on details 1, URL unchanged.
+    cy.ionPageVisible('home-details-page-1');
+    cy.location('pathname').should('eq', '/routing/tabs/home/details/1');
+    cy.location('search').should('eq', '?hello=there');
+  });
+
   /*
     Tests to add:
     Test that lifecycle events fire