Prevent navigation to "preventNativeSelection enabled" tabs that are on

stack of more navigation controller

In such cases, now we emit an `OnTabSelectionPrevented` event. I've
thought about whether we should, but I came to conclusion that it is
better to expose this information and let user ignore it, than not
expose it at all, in the end we're effectively preventing user
navigation to such tab.

In the future we might consider adding some payload to indicate that
the prevention happened exactly in such case, so that it is easier to ignore.

Author: kkafar

ios/tabs/host/RNSTabBarController.mm

@@ -278,6 +278,7 @@ - (void)userDidSelectViewController:(nonnull UIViewController *)viewController
   [self updateNavigationStateOnModelUpdate];
 
   if ([self isSelectedViewControllerTheMoreNavigationController]) {
+    [self disableNavigationBarInMoreNavigationController];
     [self setupMoreNavigationControllerDelegateIfNeeded];
   }
 
@@ -348,9 +349,23 @@ - (BOOL)tabBarController:(UITabBarController *)tabBarController
   if (shouldPreventTabSelection) {
     // Ideally we'd call this AFTER we prevent, but there is no appropriate callback.
     [self onDidPreventUserFromSelectingViewControllerWithKey:[self screenKeyForViewController:viewController]];
+    return NO;
   }
 
-  return !shouldPreventTabSelection;
+  // If we're gonna allow navigation to `moreNavigationController`, then we need to ensure
+  // that on top of its stack there is no controller with preventNativeSelection enabled.
+  // In such case, we want to pop to root.
+  // We do it here, because in `tabBarController:didSelectViewController:` we won't receive
+  // `moreNavigationController` in case there is already a tab pushed on the stack.
+  if ([self isViewControllerTheMoreNavigationController:viewController]) {
+    auto *poppedViewController = [self popToRootInMoreNavigationControllerRespectSelectionPrevention:YES animated:NO];
+    if (poppedViewController != nil) {
+      // We actually popped something -> let's notify JS realm of this fact.
+      [self onDidPreventUserFromSelectingViewControllerWithKey:[self screenKeyForViewController:poppedViewController]];
+    }
+  }
+
+  return YES;
 }
 
 - (void)tabBarController:(UITabBarController *)tabBarController
@@ -366,10 +381,6 @@ - (void)tabBarController:(UITabBarController *)tabBarController
       @"[RNScreens] Unexpected type of controller: %@",
       viewController.class);
 
-  if (isNextViewControllerMoreNavigationController) {
-    [self disableNavigationBarInMoreNavigationController];
-  }
-
   [self userDidSelectViewController:viewController];
 }
 
@@ -513,7 +524,7 @@ - (void)updateSelectedViewControllerInner
 
     // Animate only if we're currently in context of more view controller.
     BOOL shouldAnimate = [self isMoreNavigationControllerTabBarItemSelected];
-    [self popToRootInMoreNavigationControllerIfNeededAnimated:shouldAnimate];
+    [self popToRootInMoreNavigationControllerRespectSelectionPrevention:NO animated:shouldAnimate];
 
     // Also disable the header - we don't control it, but it impacts the layout
     // in ways Yoga is not aware of. The simplest option here is to disable it.
@@ -722,18 +733,56 @@ - (BOOL)isMoreNavigationControllerTabBarItemSelected
 - (void)disableNavigationBarInMoreNavigationController
 {
 #if RNS_MORE_NAVIGATION_CONTROLLER_AVAILABLE
-  [self.moreNavigationController setNavigationBarHidden:YES animated:NO];
+  if (!self.moreNavigationController.navigationBar.isHidden) {
+    [self.moreNavigationController setNavigationBarHidden:YES animated:NO];
+  }
 #endif // RNS_MORE_NAVIGATION_CONTROLLER_AVAILABLE
 }
 
-- (void)popToRootInMoreNavigationControllerIfNeededAnimated:(BOOL)isAnimated
+- (nullable UIViewController *)popToRootInMoreNavigationControllerRespectSelectionPrevention:
+                                   (BOOL)shouldRespectSelectionPrevention
+                                                                                    animated:(BOOL)shouldAnimate
 {
 #if RNS_MORE_NAVIGATION_CONTROLLER_AVAILABLE
   if ([self isMoreNavigationControllerPresentInTabBar] && self.moreNavigationController.viewControllers.count > 1) {
     // We quietly assume here, that the root view controller is the `UIMoreListViewController`.
-    [self.moreNavigationController popToRootViewControllerAnimated:isAnimated];
+    if (shouldRespectSelectionPrevention) {
+      UIViewController *topViewController = self.moreNavigationController.topViewController;
+      RCTAssert(
+          [topViewController isKindOfClass:RNSTabsScreenViewController.class],
+          @"[RNScreens] Unexpected type of view controller on moreNavigationControllerStack: %@",
+          topViewController.class);
+      RNSTabsScreenViewController *screenController = static_cast<RNSTabsScreenViewController *>(topViewController);
+      if (screenController.isPreventNativeSelectionEnabled) {
+        return [self popToRootMoreNavigationController:self.moreNavigationController animated:shouldAnimate];
+      }
+    } else {
+      return [self popToRootMoreNavigationController:self.moreNavigationController animated:shouldAnimate];
+    }
   }
 #endif // RNS_MORE_NAVIGATION_CONTROLLER_AVAILABLE
+  return nil;
+}
+
+/**
+ * Pops the top view controller from more navigation controller. We expect at most two controllers on the stack of more
+ * navigation controller. If this assumption ever becomes invalid, this method needs to be updated.
+ *
+ * @returns nil if there was nothing to pop, the topViewController otherwise.
+ */
+- (nullable UIViewController *)popToRootMoreNavigationController:
+                                   (nonnull UINavigationController *)moreNavigationController
+                                                        animated:(BOOL)animated
+{
+  if (moreNavigationController.viewControllers.count < 2) {
+    return nil;
+  }
+
+  auto *poppedViewControllers = [moreNavigationController popToRootViewControllerAnimated:animated];
+  RCTAssert(
+      poppedViewControllers != nil && poppedViewControllers.count == 1,
+      @"[RNScreens] Expected exactly one view controller to be popped");
+  return [poppedViewControllers firstObject];
 }
 
 - (void)setupMoreNavigationControllerDelegateIfNeeded