[iOS] Fix stale bottom safe area after changing SafeAreaEdges with keyboard open

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue28986_ContentPage.cs

@@ -130,5 +130,36 @@ public void SafeAreaPerEdgeValidation()
 			Assert.That(containerPositionWithoutSoftInput.Height, Is.EqualTo(containerPosition.Height), "ContentGrid height should return to original when Soft Input is dismissed with Container edges");
 		});
 	}
+
+	[Test]
+	[Category(UITestCategories.SafeAreaEdges)]
+	public void SafeAreaNoWhiteSpaceAfterKeyboardDismissAndEdgeToggle()
+	{
+		App.WaitForElement("ContentGrid");
+
+		App.Tap("GridResetAllButton");
+		var baselinePosition = App.WaitForElement("ContentGrid").GetRect();
+
+		App.Tap("SoftInputTestEntry");
+		App.RetryAssert(() =>
+		{
+			var withKeyboard = App.WaitForElement("ContentGrid").GetRect();
+			Assert.That(withKeyboard.Height, Is.LessThan(baselinePosition.Height),
+				"ContentGrid should shrink when keyboard is showing with SafeAreaEdges=All");
+		});
+
+		App.Tap("GridSetContainerButton");
+		App.DismissKeyboard();
+		App.Tap("GridResetAllButton");
+
+		App.RetryAssert(() =>
+		{
+			var finalPosition = App.WaitForElement("ContentGrid").GetRect();
+			Assert.That(finalPosition.Height, Is.EqualTo(baselinePosition.Height).Within(1),
+				"ContentGrid height should match baseline after toggling edges with keyboard dismiss — no white space (#34846)");
+			Assert.That(finalPosition.Y, Is.EqualTo(baselinePosition.Y).Within(1),
+				"ContentGrid Y should match baseline after toggling edges with keyboard dismiss");
+		});
+	}
 }
 #endif

src/Core/src/Platform/iOS/MauiView.cs

@@ -323,6 +323,13 @@ void UnsubscribeFromKeyboardNotifications()
 				NSNotificationCenter.DefaultCenter.RemoveObserver(hideObserver);
 				_keyboardWillHideObserver = null;
 			}
+
+			// Clear stale keyboard state so that re-subscribing later doesn't
+			// pick up a phantom keyboard frame from a previous session (#34846).
+			if (_isKeyboardShowing)
+			{
+				ClearKeyboardState();
+			}
 		}
 
 		void UpdateKeyboardSubscription()
@@ -353,7 +360,9 @@ void OnKeyboardWillShow(NSNotification notification)
 			}
 		}
 
-		void OnKeyboardWillHide(NSNotification notification)
+		void OnKeyboardWillHide(NSNotification notification) => ClearKeyboardState();
+
+		void ClearKeyboardState()
 		{
 			_safeAreaInvalidated = true;
 			_keyboardFrame = CGRect.Empty;