Bug 1850316 - Use alternative ways to get backQueue elements.

backQueue is now private in NavController.

app/src/main/java/org/mozilla/fenix/ext/NavController.kt

@@ -68,7 +68,7 @@ fun NavController.navigateWithBreadcrumb(
  */
 @SuppressLint("RestrictedApi")
 fun NavController.hasTopDestination(fragmentClassName: String): Boolean {
-    return this.backQueue.lastOrNull()?.destination?.displayName?.contains(
+    return this.currentBackStackEntry?.destination?.displayName?.contains(
         fragmentClassName,
         true,
     ) == true

app/src/main/java/org/mozilla/fenix/search/SearchDialogFragment.kt

@@ -959,7 +959,7 @@ class SearchDialogFragment : AppCompatDialogFragment(), UserInteractionHandler {
     internal fun getPreviousDestination(): NavBackStackEntry? {
         // This duplicates the platform functionality for "previousBackStackEntry" but additionally skips this entry.
 
-        val descendingEntries = findNavController().backQueue.reversed().iterator()
+        val descendingEntries = findNavController().currentBackStack.value.reversed().iterator()
         // Throw the topmost destination away.
         if (descendingEntries.hasNext()) {
             descendingEntries.next()

app/src/test/java/org/mozilla/fenix/search/SearchDialogFragmentTest.kt

@@ -50,14 +50,14 @@ internal class SearchDialogFragmentTest {
 
     @Test
     fun `GIVEN this is the only visible fragment WHEN asking for the previous destination THEN return null`() {
-        every { navController.backQueue } returns ArrayDeque(listOf(getDestination(fragmentName)))
+        every { navController.currentBackStack.value } returns ArrayDeque(listOf(getDestination(fragmentName)))
 
         assertNull(fragment.getPreviousDestination())
     }
 
     @Test
     fun `GIVEN this and FragmentB on top of this are visible WHEN asking for the previous destination THEN return null`() {
-        every { navController.backQueue } returns ArrayDeque(
+        every { navController.currentBackStack.value } returns ArrayDeque(
             listOf(
                 getDestination(fragmentName),
                 getDestination("FragmentB"),
@@ -70,7 +70,7 @@ internal class SearchDialogFragmentTest {
     @Test
     fun `GIVEN FragmentA, this and FragmentB are visible WHEN asking for the previous destination THEN return FragmentA`() {
         val fragmentADestination = getDestination("FragmentA")
-        every { navController.backQueue } returns ArrayDeque(
+        every { navController.currentBackStack.value } returns ArrayDeque(
             listOf(
                 fragmentADestination,
                 getDestination(fragmentName),
@@ -84,7 +84,7 @@ internal class SearchDialogFragmentTest {
     @Test
     fun `GIVEN FragmentA and this on top of it are visible WHEN asking for the previous destination THEN return FragmentA`() {
         val fragmentADestination = getDestination("FragmentA")
-        every { navController.backQueue } returns ArrayDeque(
+        every { navController.currentBackStack.value } returns ArrayDeque(
             listOf(
                 fragmentADestination,
                 getDestination(fragmentName),