Use tabs instead of spaces.

BuildTools/tidy.py

@@ -13,7 +13,7 @@ def main():
 	root_dir = os.path.normpath(os.path.join(os.path.dirname(__file__), '..'))
 	dirs_to_check = (
 		os.path.join(root_dir, subdir)
-		for subdir in ('ICSharpCode.Decompiler', 'ILSpy', 'ILSpy.BamlDecompiler'))
+		for subdir in ('ICSharpCode.Decompiler', 'ICSharpCode.Decompiler.Tests', 'ILSpy', 'ILSpy.BamlDecompiler'))
 	ok = True
 	for dir in dirs_to_check:
 		for root, dirs, files in os.walk(dir):

ICSharpCode.Decompiler.Tests/CorrectnessTestRunner.cs

@@ -25,7 +25,7 @@ using NUnit.Framework;
 
 namespace ICSharpCode.Decompiler.Tests
 {
-    [TestFixture]
+	[TestFixture]
 	public class CorrectnessTestRunner
 	{
 		const string TestCasePath = DecompilerTestBase.TestCasePath + "/Correctness";

ICSharpCode.Decompiler.Tests/Stub.cs

@@ -21,10 +21,10 @@ using System;
 namespace ICSharpCode.Decompiler.Tests
 {
 	class Stub
-    {
+	{
 		static void Main(string[] args)
 		{
 			throw new InvalidOperationException("Entry point exists only to support output type 'Exe'");
 		}
-    }
+	}
 }

ICSharpCode.Decompiler.Tests/TestCases/ILPretty/Issue379.cs

@@ -2,8 +2,8 @@
 
 namespace ICSharpCode.Decompiler.Tests.TestCases.ILPretty
 {
-    internal class Issue379
-    {
+	internal class Issue379
+	{
 		public virtual void Test<T>() where T : new()
 		{
 		}