Switch to per-line arguments

ILSpy.AddIn.Shared/ILSpyInstance.cs

@@ -52,7 +52,7 @@ namespace ICSharpCode.ILSpy.AddIn
 
 			if ((commandLineArguments != null) && commandLineArguments.Any())
 			{
-				string assemblyArguments = string.Join(" ", commandLineArguments);
+				string assemblyArguments = string.Join("\r\n", commandLineArguments);
 
 				string filepath = Path.GetTempFileName();
 				File.WriteAllText(filepath, assemblyArguments);

ILSpy.Tests/CommandLineArgumentsTests.cs

@@ -100,14 +100,22 @@ namespace ICSharpCode.ILSpy.Tests
 		}
 
 		[Test]
-		public void PassAtFileArgumentsSpaceSeparated()
+		public void PassAtFileArguments()
 		{
 			string filepath = System.IO.Path.GetTempFileName();
 
-			System.IO.File.WriteAllText(filepath, "assembly1 assembly2 assembly3 --newinstance --noactivate");
+			System.IO.File.WriteAllText(filepath, "assembly1\r\nassembly2\r\nassembly3\r\n--newinstance\r\n--noactivate");
 
 			var cmdLineArgs = new CommandLineArguments(new string[] { $"@{filepath}" });
 
+			try
+			{
+				System.IO.File.Delete(filepath);
+			}
+			catch (Exception)
+			{
+			}
+
 			cmdLineArgs.SingleInstance.Should().BeFalse();
 			cmdLineArgs.NoActivate.Should().BeTrue();
 			cmdLineArgs.AssembliesToLoad.Should().HaveCount(3);

ILSpy/CommandLineArguments.cs

@@ -40,7 +40,7 @@ namespace ICSharpCode.ILSpy
 		{
 			var app = new CommandLineApplication() {
 				// https://natemcmaster.github.io/CommandLineUtils/docs/response-file-parsing.html?tabs=using-attributes
-				ResponseFileHandling = ResponseFileHandling.ParseArgsAsSpaceSeparated,
+				ResponseFileHandling = ResponseFileHandling.ParseArgsAsLineSeparated,
 
 				// Note: options are case-sensitive (!), and, default behavior would be UnrecognizedArgumentHandling.Throw on Parse()
 				// UnrecognizedArgumentHandling = UnrecognizedArgumentHandling.CollectAndContinue