⭐️ Impl: RNIModalManager.getWindows

Related:
* TODO:2023-03-04-06-34-28 - Library Native Cleanup
* TODO:2023-03-04-15-39-46 - Impl. `RNIModalManager`

Summary:
* Impl. `RNIModalManager.getWindows`.
* Refactor `RNIModalManager.getRootViewController` to use `getWindows`.

ios/src_library/React Native/RNIModal/RNIModalManager.swift

@@ -20,47 +20,75 @@ public class RNIModalManager {
   // ------------------------
 
   /// TODO:2023-03-20-21-29-36 - Move to `RNIUtilities`
-  static func getRootViewController(
-    for window: UIWindow? = nil
-  ) -> UIViewController? {
-
-    if let window = window {
-      return window.rootViewController;
-    };
+  static func getWindows() -> [UIWindow] {
+    var windows: [UIWindow] = [];
 
     #if swift(>=5.5)
     // Version: Swift 5.5 and newer - iOS 15 and newer
-    guard #available(iOS 13.0, *) else { return nil  };
-
-    let scenes = UIApplication.shared.connectedScenes;
+    guard #available(iOS 13.0, *) else { return [] };
 
-    guard let windowScene = scenes.first as? UIWindowScene,
-          let window = windowScene.windows.first
-    else { return nil };
-
-    return window.rootViewController;
+    for scene in UIApplication.shared.connectedScenes {
+      guard let windowScene = scene as? UIWindowScene else { continue };
+      windows += windowScene.windows;
+    };
 
     #elseif swift(>=5)
     // Version: Swift 5.4 and below - iOS 14.5 and below
     // Note: 'windows' was deprecated in iOS 15.0+
-    guard let window = UIApplication.shared.windows.first else { return nil };
-    return window.rootViewController;
+
+    // first element is the "key window"
+    if let keyWindow =
+        UIApplication.shared.windows.first(where: { $0.isKeyWindow }) {
+
+      windows.append(keyWindow);
+    };
+
+    UIApplication.shared.windows.forEach {
+      // skip if already added
+      guard !windows.contains($0) else { return };
+      windows.append($0);
+    };
 
     #elseif swift(>=4)
     // Version: Swift 4 and below - iOS 12.4 and below
     // Note: `keyWindow` was deprecated in iOS 13.0+
-    guard let window = UIApplication.shared.keyWindow else { return nil };
-    return window.rootViewController;
+
+    // first element is the "key window"
+    if let keyWindow = UIApplication.shared.keyWindow {
+      windows.append(keyWindow);
+    };
+
+    UIApplication.shared.windows.forEach {
+      // skip if already added
+      guard !windows.contains($0) else { return };
+      windows.append($0);
+    };
 
     #else
     // Version: Swift 3.1 and below - iOS 10.3 and below
     // Note: 'sharedApplication' has been renamed to 'shared'
-    guard let appDelegate = UIApplication.sharedApplication().delegate as? AppDelegate,
+    guard let appDelegate =
+            UIApplication.sharedApplication().delegate as? AppDelegate,
+
           let window = appDelegate.window
-    else { return nil };
+    else { return [] };
 
-    return window.rootViewController;
+    return windows.append(window);
     #endif
+
+    return windows;
+  };
+
+  /// TODO:2023-03-20-21-29-36 - Move to `RNIUtilities`
+  static func getRootViewController(
+    for window: UIWindow? = nil
+  ) -> UIViewController? {
+
+    if let window = window {
+      return window.rootViewController;
+    };
+
+    return Self.getWindows().first?.rootViewController;
   };
 
   /// TODO:2023-03-20-21-29-36 - Move to `RNIUtilities`