[Windows] Fixed the Pasted Password Becomes Visible When IsPassword Is Enabled (#30353)

* Fixed the masked text issue of same value pasted into the textbox field

* Added the test for verifying the masked text

Author: Ahamed-Ali

src/Controls/tests/DeviceTests/Elements/Entry/EntryTests.Windows.cs

@@ -76,5 +76,41 @@ public async Task EntryAlignmentMatchesFlowDirection(bool isExplicit, FlowDirect
 
 			Assert.Equal(expectedAlignment, nativeAlignment);
 		}
+
+		[Fact]
+		[Description("Password entry should refresh obfuscation when identical text is pasted")]
+		public async Task PasswordEntryObfuscatesIdenticalPastedText()
+		{
+			var entry = new Entry
+			{
+				Text = "password123",
+				IsPassword = true
+			};
+
+			await InvokeOnMainThreadAsync(() =>
+			{
+				var handler = CreateHandler<EntryHandler>(entry);
+				var platformControl = GetPlatformControl(handler);
+				var passwordTextBox = platformControl as Microsoft.Maui.Platform.MauiPasswordTextBox;
+
+				Assert.NotNull(passwordTextBox);
+				Assert.True(passwordTextBox.IsPassword);
+
+				// Verify the text is initially obfuscated
+				Assert.Equal(new string('●', entry.Text.Length), passwordTextBox.Text);
+
+				// Simulate pasting the same text by setting the same text value
+				passwordTextBox.Text = "password123";
+
+				// This is equivalent to what happens when a user pastes identical text via Ctrl+V
+				passwordTextBox.GetType().GetMethod("UpdatePasswordIfNeeded",
+					System.Reflection.BindingFlags.NonPublic |
+					System.Reflection.BindingFlags.Instance)?.Invoke(passwordTextBox, null);
+
+
+				// Verify the text is still properly obfuscated after the "paste" operation
+				Assert.Equal(new string('●', entry.Text.Length), passwordTextBox.Text);
+			});
+		}
 	}
 }

src/Core/src/Platform/Windows/MauiPasswordTextBox.cs

@@ -298,7 +298,15 @@ void UpdatePasswordIfNeeded()
 			var updatedPassword = DetermineTextFromPassword(Password, SelectionStart, Text);
 
 			if (Password != updatedPassword)
+			{
 				Password = updatedPassword;
+			}
+			else
+			{
+				// Ensure the UI properly refreshes when text is pasted with the same value
+				// Without this, pasting identical text via Ctrl+V doesn't trigger obfuscation
+				UpdateVisibleText();
+			}
 		}
 
 		static string Obfuscate(string text, bool leaveLastVisible = false)