[release/5.0-rc2] Fix the globalization test. (#42226)

* Fix the globalization test.

The failure is because Windows regresion. The change here is to avoid having the test fail because of that. The regression is tracked by Windows team to fix it.

* Add a comment

Co-authored-by: Tarek Mahmoud Sayed <tarekms@microsoft.com>

Author: github-actions[bot]

src/libraries/System.Globalization/tests/CompareInfo/CompareInfoTests.cs

@@ -3,6 +3,7 @@
 
 using System.Buffers;
 using System.Collections.Generic;
+using System.Runtime.InteropServices;
 using System.Reflection;
 using System.Text;
 using Xunit;
@@ -359,6 +360,16 @@ public void SortKeyKanaTest(CompareInfo compareInfo, string string1, string stri
             SortKeyTest(compareInfo, string1, string2, options, expected);
         }
 
+
+        [DllImport("kernel32", CharSet = CharSet.Unicode)]
+        private static extern int CompareStringEx(string lpLocaleName, uint dwCmpFlags, string lpString1, int cchCount1, string lpString2, int cchCount2, IntPtr lpVersionInformation, IntPtr lpReserved, int lParam);
+        private const int NORM_LINGUISTIC_CASING = 0x08000000;       // use linguistic rules for casing
+
+        // Windows has introduced a regression when comparing 2 strings containing zero sort weight characters (e.g. “” and “\u200C”) when using the NORM_LINGUISTIC_CASING flag.
+        // This code can be deleted after Windows fix the regression.
+        private static bool WindowsVersionHasTheCompareStringRegression =>
+                    PlatformDetection.IsNlsGlobalization && CompareStringEx("", NORM_LINGUISTIC_CASING, "", 0, "\u200C", 1, IntPtr.Zero, IntPtr.Zero, 0) != 2;
+
         [Theory]
         [MemberData(nameof(SortKey_TestData))]
         public void SortKeyTest(CompareInfo compareInfo, string string1, string string2, CompareOptions options, int expectedSign)
@@ -368,7 +379,11 @@ public void SortKeyTest(CompareInfo compareInfo, string string1, string string2,
 
             Assert.Equal(expectedSign, Math.Sign(SortKey.Compare(sk1, sk2)));
             Assert.Equal(expectedSign == 0, sk1.Equals(sk2));
-            Assert.Equal(Math.Sign(compareInfo.Compare(string1, string2, options)), Math.Sign(SortKey.Compare(sk1, sk2)));
+
+            if (!WindowsVersionHasTheCompareStringRegression)
+            {
+                Assert.Equal(Math.Sign(compareInfo.Compare(string1, string2, options)), Math.Sign(SortKey.Compare(sk1, sk2)));
+            }
 
             Assert.Equal(compareInfo.GetHashCode(string1, options), sk1.GetHashCode());
             Assert.Equal(compareInfo.GetHashCode(string2, options), sk2.GetHashCode());