Fix #3272: Missing variable declarations in repeated nested for-loops

ICSharpCode.Decompiler.Tests/PrettyTestRunner.cs

@@ -736,7 +736,7 @@ async Task Run([CallerMemberName] string testName = null, AssemblerOptions asmOp
 			var decompiled = await Tester.DecompileCSharp(exeFile, decompilerSettings ?? Tester.GetSettings(cscOptions)).ConfigureAwait(false);
 
 			// 3. Compile
-			CodeAssert.FilesAreEqual(csFile, decompiled, Tester.GetPreprocessorSymbols(cscOptions).ToArray());
+			CodeAssert.FilesAreEqual(csFile, decompiled, Tester.GetPreprocessorSymbols(cscOptions).Append("EXPECTED_OUTPUT").ToArray());
 			Tester.RepeatOnIOError(() => File.Delete(decompiled));
 		}
 	}

ICSharpCode.Decompiler.Tests/TestCases/Pretty/VariableNaming.cs

@@ -60,5 +60,33 @@ private void Issue1881()
 #pragma warning restore CS0219
 		}
 #endif
+
+		private static void NestedForLoopTest(int sizeX, int sizeY, int[] array)
+		{
+			for (int y = 0; y < sizeY; y++)
+			{
+				for (int x = 0; x < sizeX; x++)
+				{
+					array[y * sizeX + x] = 0;
+				}
+			}
+#if !EXPECTED_OUTPUT || (LEGACY_CSC && !OPT)
+			for (int y = 0; y < sizeY; y++)
+			{
+				for (int x = 0; x < sizeX; x++)
+				{
+					array[y * sizeX + x] = 1;
+				}
+			}
+#else
+			for (int i = 0; i < sizeY; i++)
+			{
+				for (int j = 0; j < sizeX; j++)
+				{
+					array[i * sizeX + j] = 1;
+				}
+			}
+#endif
+		}
 	}
 }

ICSharpCode.Decompiler/IL/Transforms/AssignVariableNames.cs

@@ -295,6 +295,8 @@ string AssignName(ILVariable v, Dictionary<ILVariable, string> variableMapping)
 					// special case for loop counters,
 					// we don't want them to be named i, i2, ..., but i, j, ...
 					newName = GenerateNameForVariable(v);
+					nameWithoutNumber = newName;
+					newIndex = 1;
 				}
 				else
 				{