[Windows] Fix RefreshView Command executes multiple times when IsRefreshing is set to True

src/Controls/tests/TestCases.HostApp/Issues/Issue31375.cs

@@ -0,0 +1,60 @@
+using System.Windows.Input;
+
+namespace Maui.Controls.Sample.Issues;
+
+[Issue(IssueTracker.Github, 31375, "[Windows] RefreshView Command executes multiple times when IsRefreshing is set to True", PlatformAffected.UWP)]
+public class Issue31375 : ContentPage
+{
+	bool _isLoading = false;
+	Label _textLabel;
+	int count = 0;
+
+	public bool IsLoading
+	{
+		get => _isLoading;
+		set
+		{
+			_isLoading = value;
+			OnPropertyChanged(nameof(IsLoading));
+		}
+	}
+
+	public ICommand RefreshCommand { get; set; }
+	public Issue31375()
+	{
+		// Create UI elements
+		var button = new Button { Text = "Click To Refresh", AutomationId = "RefreshButton" };
+		button.Clicked += Button_Clicked;
+
+		_textLabel = new Label() { AutomationId = "CounterLabel" };
+		_textLabel.Text = count++.ToString();
+
+		// Set BindingContext
+		BindingContext = this;
+
+		// Assign command
+		RefreshCommand = new Command(AddItems);
+		var refreshView = new RefreshView
+		{
+			Margin = 16,
+			Content = _textLabel,
+		};
+		refreshView.SetBinding(RefreshView.IsRefreshingProperty, nameof(IsLoading));
+		refreshView.SetBinding(RefreshView.CommandProperty, nameof(RefreshCommand));
+		Content = new StackLayout
+		{
+			Children = { refreshView, button }
+		};
+	}
+
+	void Button_Clicked(object sender, EventArgs e)
+    {
+        IsLoading = true;
+    }
+
+    void AddItems()
+    {
+        IsLoading = false;
+        _textLabel.Text = count++.ToString();
+    }
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue31375.cs

@@ -0,0 +1,24 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue31375 : _IssuesUITest
+	{
+		public Issue31375(TestDevice device) : base(device)
+		{
+		}
+
+		public override string Issue => "[Windows] RefreshView Command executes multiple times when IsRefreshing is set to True";
+
+		[Test]
+		[Category(UITestCategories.RefreshView)]
+		public void VerifyRefreshViewCommandExecution()
+		{
+			App.WaitForElement("CounterLabel");
+			App.Tap("RefreshButton");
+			Assert.That(App.FindElement("CounterLabel").GetText(), Is.EqualTo("1"));
+		}
+	}
+}

src/Core/src/Handlers/RefreshView/RefreshViewHandler.Windows.cs

@@ -139,8 +139,10 @@ void OnRefresh(object sender, RefreshRequestedEventArgs args)
 			CompleteRefresh();
 			_refreshCompletionDeferral = args.GetDeferral();
 
-			if (VirtualView != null)
+			if (VirtualView != null && !VirtualView.IsRefreshing)
+			{
 				VirtualView.IsRefreshing = true;
+			}
 		}
 
 		void CompleteRefresh()