Only set the popup contents parent if it hasn't already been set befo…

…re (#2199)

Co-authored-by: Shaun Lawrence <[email protected]>

src/CommunityToolkit.Maui/Views/Popup/Popup.shared.cs

@@ -384,7 +384,12 @@ protected override void OnBindingContextChanged()
 		if (Content is not null)
 		{
 			SetInheritedBindingContext(Content, BindingContext);
-			Content.Parent = this;
+
+			if (ReferenceEquals(Content.Parent, this) is false)
+			{
+				Content.Parent = null;
+				Content.Parent = this;
+			}
 		}
 	}