fix: reset parentStack when not part of a viewStack

Author: BlenMiner

Assets/PurrUI/Runtime/MonoView.cs

@@ -12,12 +12,17 @@ public class MonoView : MonoBehaviour
 
         public CanvasGroup canvasGroup { get; private set; }
 
-        public ViewStack parentStack { get; private set; }
+        public ViewStack parentStack { get; internal set; }
 
         public bool cullWindowsBehind => _cullWindowsBehind;
 
         public bool isTopMost => parentStack && parentStack.top == this;
 
+        /// <summary>
+        /// Returns true if this view is currently part of a ViewStack.
+        /// </summary>
+        public bool isInStack => parentStack;
+
         public Canvas canvas { get; private set; }
 
         /// <summary>

Assets/PurrUI/Runtime/ViewStack.cs

@@ -286,6 +286,7 @@ public void Pop(MonoView instance)
 
             _stack.RemoveAt(idx);
             instance.OnPopped();
+            instance.parentStack = null;
 
             var transition = instance.ExitTransition();
             if (transition != null)
@@ -384,6 +385,7 @@ private void RemoveTop()
             var topView = _stack[^1];
             _stack.RemoveAt(_stack.Count - 1);
             topView.OnPopped();
+            topView.parentStack = null;
 
             var transition = topView.ExitTransition();
             if (transition != null)