Fix System.OverflowException in CustomScrollViewerEx during Mouse Wheel scroll

Flow.Launcher.Test/Flow.Launcher.Test.csproj

@@ -39,6 +39,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <ProjectReference Include="..\Flow.Launcher\Flow.Launcher.csproj" />
     <ProjectReference Include="..\Plugins\Flow.Launcher.Plugin.Calculator\Flow.Launcher.Plugin.Calculator.csproj" />
     <ProjectReference Include="..\Plugins\Flow.Launcher.Plugin.Explorer\Flow.Launcher.Plugin.Explorer.csproj" />
     <ProjectReference Include="..\Plugins\Flow.Launcher.Plugin.Program\Flow.Launcher.Plugin.Program.csproj" />

Flow.Launcher.Test/MouseWheelTest.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Reflection;
+using System.Windows;
+using System.Windows.Input;
+using System.Windows.Interop;
+using Flow.Launcher.Resources.Controls;
+using NUnit.Framework;
+
+namespace Flow.Launcher.Test;
+
+[TestFixture]
+public class MouseWheelTest
+{
+    [Test]
+    [RequiresThread(System.Threading.ApartmentState.STA)]
+    public void Test_Scroll_MouseWheel()
+    {
+        var scrollView = new CustomScrollViewerEx();
+
+        var mouseDevice = Mouse.PrimaryDevice;
+        var e = new MouseWheelEventArgs(mouseDevice, Environment.TickCount, 120)
+        {
+            RoutedEvent = UIElement.MouseWheelEvent
+        };
+
+        var onMouseWheelMethod = typeof(CustomScrollViewerEx).GetMethod(
+            "OnMouseWheel",
+            BindingFlags.NonPublic | BindingFlags.Instance
+        );
+
+        Assert.DoesNotThrow(() =>
+        {
+            onMouseWheelMethod.Invoke(scrollView, new object[] { e });
+        });
+    }
+}

Flow.Launcher/Resources/Controls/CustomScrollViewerEx.cs

@@ -44,8 +44,7 @@ public Orientation Orientation
         #region AutoHideScrollBars
 
         public static readonly DependencyProperty AutoHideScrollBarsProperty =
-            ScrollViewerHelper.AutoHideScrollBarsProperty
-            .AddOwner(
+            ScrollViewerHelper.AutoHideScrollBarsProperty.AddOwner(
                 typeof(CustomScrollViewerEx),
                 new PropertyMetadata(true, OnAutoHideScrollBarsChanged));
 
@@ -86,6 +85,9 @@ protected override void OnInitialized(EventArgs e)
         /// <inheritdoc/>
         protected override void OnMouseWheel(MouseWheelEventArgs e)
         {
+            if (ActualHeight <= 0)
+                return;
+
             var Direction = GetDirection();
             ScrollViewerBehavior.SetIsAnimating(this, true);