Bug 1862537 - Do not try to go back when it's a initial load...

Bug 1862537 - Do not try to go back when it's a initial load r=android-reviewers,harrisono, a=pascalc

Differential Revision: https://phabricator.services.mozilla.com/D219782

mobile/android/android-components/components/browser/engine-gecko/src/main/java/mozilla/components/browser/engine/gecko/GeckoEngineSession.kt

@@ -1120,12 +1120,15 @@ class GeckoEngineSession(
                 return
             }
 
+            // if it is an initial load then we can't go back. We should update the URL.
+            if (!initialLoad) {
                 appRedirectUrl?.let {
                     if (url == appRedirectUrl) {
                         goBack(false)
                         return
                     }
                 }
+            }
 
             currentUrl = url
             initialLoad = false

mobile/android/android-components/components/browser/engine-gecko/src/test/java/mozilla/components/browser/engine/gecko/GeckoEngineSessionTest.kt

@@ -1049,6 +1049,7 @@ class GeckoEngineSessionTest {
         )
         engineSession.settings.historyTrackingDelegate = historyTrackingDelegate
         engineSession.appRedirectUrl = emptyPageUrl
+        engineSession.initialLoad = false
 
         class MockHistoryList(
             items: List<GeckoSession.HistoryDelegate.HistoryItem>,