[FIX] tool-update: Compare tool versions correctly (#44517)

Author: edvilme

src/Cli/dotnet/commands/dotnet-tool/install/ToolInstallGlobalOrToolPathCommand.cs

@@ -249,7 +249,7 @@ private NuGetVersion GetBestMatchNugetVersion(PackageId packageId, VersionRange
 
         private static bool ToolVersionAlreadyInstalled(IToolPackage oldPackageNullable, NuGetVersion nuGetVersion)
         {
-            return oldPackageNullable != null && (oldPackageNullable.Version.Version == nuGetVersion.Version);
+            return oldPackageNullable != null && (oldPackageNullable.Version == nuGetVersion);
         }
 
         private static void EnsureVersionIsHigher(IToolPackage oldPackageNullable, IToolPackage newInstalledPackage, bool allowDowngrade)

test/dotnet.Tests/CommandTests/ToolUpdateGlobalOrToolPathCommandTests.cs

@@ -200,6 +200,21 @@ public void GivenAnExistedLowerversionInstallationWhenUpdateAllItCanPrintSuccess
                 _packageId, LowerPackageVersion, HigherPackageVersion));
         }
 
+        [Fact]
+        public void GivenAnExistedPreviewVersionInstallationWhenUpdateToHigherVersionItSucceeds()
+        {
+            var installCommand = CreateInstallCommand($"-g {_packageId} --version {HigherPreviewPackageVersion} --verbosity minimal");
+            installCommand.Execute();
+            _reporter.Lines.Clear();
+
+            var command = CreateUpdateCommand($"-g {_packageId} --version {HigherPackageVersion} --verbosity minimal");
+            command.Execute().Should().Be(0);
+
+            _reporter.Lines.First().Should().Contain(string.Format(
+                LocalizableStrings.UpdateSucceeded,
+                _packageId, HigherPreviewPackageVersion, HigherPackageVersion));
+        }
+
         [Fact]
         public void GivenAnExistedHigherversionInstallationWhenUpdateToLowerVersionItErrors()
         {