fix: misc warning

- Warning CA1815 PlatformGraphicsExternalImageProperties should override Equals Avalonia.Base (net6.0) \src\Avalonia.Base\Platform\PlatformGraphicsExternalMemory.cs 7 N/A
- Warning CA1823 Unused field 'ProximityPoints' Avalonia.Controls (net6.0) src\Avalonia.Controls\Presenters\ScrollContentPresenter.cs 18 N/A
- Warning CS0169 The field 'VulkanDemoControl._vkInstance' is never used GpuInterop samples\GpuInterop\VulkanDemo\VulkanDemoControl.cs 19 N/A
- Warning CS0169 The field 'VulkanDemoControl._api' is never used GpuInterop samples\GpuInterop\VulkanDemo\VulkanDemoControl.cs 20 N/A
- Warning CS0219 The variable 'isZooming' is assigned but its value is never used ControlCatalog (netstandard2.0) samples\ControlCatalog\Pages\GesturePage.cs 73 N/A
- Warning xUnit2004 Do not use Assert.Equal() to check for boolean conditions. Avalonia.IntegrationTests.Appium tests\Avalonia.IntegrationTests.Appium\WindowTests_MacOS.cs 267 N/A

samples/ControlCatalog/Pages/GesturePage.cs

@@ -70,7 +70,6 @@ namespace ControlCatalog.Pages
 
             _currentScale = 1;
             Vector3 currentOffset = default;
-            bool isZooming = false;
 
             CompositionVisual? compositionVisual = null;
 

samples/GpuInterop/VulkanDemo/VulkanDemoControl.cs

@@ -1,24 +1,12 @@
 using System;
-using System.Collections;
-using System.Collections.Generic;
-using System.Linq;
-using System.Runtime.InteropServices;
 using System.Threading.Tasks;
 using Avalonia;
-using Avalonia.Platform;
 using Avalonia.Rendering.Composition;
-using Silk.NET.Core;
-using Silk.NET.Vulkan;
-using Silk.NET.Vulkan.Extensions.KHR;
-using SilkNetDemo;
 
 namespace GpuInterop.VulkanDemo;
 
 public class VulkanDemoControl : DrawingSurfaceDemoBase
 {
-    private Instance _vkInstance;
-    private Vk _api;
-
     class VulkanResources : IAsyncDisposable
     {
         public VulkanContext Context { get; }

src/Avalonia.Base/Platform/PlatformGraphicsExternalMemory.cs

@@ -1,10 +1,6 @@
-using System;
-using System.Collections.Generic;
-using System.Threading.Tasks;
-
 namespace Avalonia.Platform;
 
-public struct PlatformGraphicsExternalImageProperties
+public record struct PlatformGraphicsExternalImageProperties
 {
     public int Width { get; set; }
     public int Height { get; set; }

src/Avalonia.Controls/Presenters/ScrollContentPresenter.cs

@@ -15,7 +15,6 @@ namespace Avalonia.Controls.Presenters
     public class ScrollContentPresenter : ContentPresenter, IPresenter, IScrollable, IScrollAnchorProvider
     {
         private const double EdgeDetectionTolerance = 0.1;
-        private const int ProximityPoints = 10;
 
         /// <summary>
         /// Defines the <see cref="CanHorizontallyScroll"/> property.

tests/Avalonia.IntegrationTests.Appium/WindowTests_MacOS.cs

@@ -264,7 +264,7 @@ namespace Avalonia.IntegrationTests.Appium
                 var secondaryWindow = GetWindow("SecondaryWindow");
                 var (_, miniaturizeButton, _) = secondaryWindow.GetChromeButtons();
 
-                Assert.Equal(false, miniaturizeButton.Enabled);
+                Assert.False(miniaturizeButton.Enabled);
             }
         }