Don't make color changes when in high contrast mode (#33529)

src/VisualStudio/Core/Def/Implementation/Experimentation/EnhancedColorExperiment.cs

@@ -8,6 +8,7 @@
 using System.ComponentModel.Composition;
 using System.Linq;
 using System.Runtime.InteropServices;
+using System.Windows;
 using EnvDTE;
 using Microsoft.CodeAnalysis.Classification;
 using Microsoft.CodeAnalysis.Editor;
@@ -96,6 +97,12 @@ private void UpdateThemeColors()
                 return;
             }
 
+            // We do not want to make any changes while in high contrast mode.
+            if (SystemParameters.HighContrast)
+            {
+                return;
+            }
+
             var currentThemeId = GetThemeId();
 
             // Get the preview feature flag value.