Fixes Crash: Pop up to Browser Fragment if exists when coming from Search

app/src/main/java/org/mozilla/fenix/HomeActivity.kt

@@ -187,8 +187,13 @@ open class HomeActivity : AppCompatActivity() {
         val directions = when (from) {
             BrowserDirection.FromGlobal -> NavGraphDirections.actionGlobalBrowser(customTabSessionId)
             BrowserDirection.FromHome -> HomeFragmentDirections.actionHomeFragmentToBrowserFragment(customTabSessionId)
-            BrowserDirection.FromSearch ->
-                SearchFragmentDirections.actionSearchFragmentToBrowserFragment(customTabSessionId)
+            BrowserDirection.FromSearch -> {
+                if (!navHost.navController.popBackStack(R.id.browserFragment, false)) {
+                    SearchFragmentDirections.actionSearchFragmentToBrowserFragment(customTabSessionId)
+                } else {
+                    null
+                }
+            }
             BrowserDirection.FromSettings ->
                 SettingsFragmentDirections.actionSettingsFragmentToBrowserFragment(customTabSessionId)
             BrowserDirection.FromBookmarks ->
@@ -208,7 +213,9 @@ open class HomeActivity : AppCompatActivity() {
         if (sessionObserver == null)
             sessionObserver = subscribeToSessions()
 
-        navHost.navController.navigate(directions)
+        directions?.let {
+            navHost.navController.navigate(it)
+        }
     }
 
     private fun load(searchTermOrURL: String, newTab: Boolean, engine: SearchEngine?, forceSearch: Boolean) {

app/src/main/java/org/mozilla/fenix/browser/BrowserFragment.kt

@@ -120,6 +120,10 @@ class BrowserFragment : Fragment(), BackHandler, CoroutineScope {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         postponeEnterTransition()
+        sharedElementEnterTransition =
+            TransitionInflater.from(context).inflateTransition(android.R.transition.move).setDuration(
+                SHARED_TRANSITION_MS
+            )
         job = Job()
     }
 
@@ -180,11 +184,6 @@ class BrowserFragment : Fragment(), BackHandler, CoroutineScope {
                 )
             }
         }
-
-        sharedElementEnterTransition =
-            TransitionInflater.from(context).inflateTransition(android.R.transition.move).setDuration(
-                SHARED_TRANSITION_MS
-            )
         startPostponedEnterTransition()
 
         QuickActionComponent(

app/src/main/res/navigation/nav_graph.xml

@@ -58,7 +58,8 @@
         <action
             android:id="@+id/action_searchFragment_to_browserFragment"
             app:destination="@id/browserFragment"
-            app:popUpTo="@id/homeFragment" />
+            app:popUpTo="@id/searchFragment"
+            app:popUpToInclusive="true" />
         <argument
             android:name="session_id"
             app:argType="string"