Allow explicit null termination character

Author: ds5678

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

@@ -447,6 +447,7 @@ private static TypeC TestC()
 #endif
 #if CS110 && !NET40
 		public static ReadOnlySpan<byte> UTF8Literal => "Hello, world!"u8;
+		public static ReadOnlySpan<byte> UTF8LiteralWithNullTerminator => "Hello, world!\0"u8;
 #endif
 		#endregion
 

ICSharpCode.Decompiler/IL/Transforms/TransformArrayInitializers.cs

@@ -182,9 +182,13 @@ private static unsafe bool DecodeUTF8String(BlobReader blob, int size, out strin
 			for (int i = 0; i < size; i++)
 			{
 				byte val = blob.CurrentPointer[i];
-				// If the string has control characters, it's probably binary data and not a string.
-				if (val < 0x20 && val is not ((byte)'\r' or (byte)'\n' or (byte)'\t'))
+				if (val == 0 && i == size - 1 && size > 1)
 				{
+					// Allow explicit null-termination character.
+				}
+				else if (val < 0x20 && val is not ((byte)'\r' or (byte)'\n' or (byte)'\t'))
+				{
+					// If the string has control characters, it's probably binary data and not a string.
 					text = null;
 					return false;
 				}