avm2+tests: Support CData in XML.toXMLString; add test

core/src/avm2/e4x.rs

@@ -681,10 +681,15 @@ fn to_xml_string_inner<'gc>(xml: E4XOrXml<'gc>, buf: &mut WString) -> Result<(),
         }
         E4XNodeKind::Attribute(_)
         | E4XNodeKind::Comment(_)
-        | E4XNodeKind::ProcessingInstruction(_)
-        | E4XNodeKind::CData(_) => {
+        | E4XNodeKind::ProcessingInstruction(_) => {
             return Err(format!("ToXMLString: Not yet implemented node {:?}", node_kind).into())
         }
+        E4XNodeKind::CData(data) => {
+            buf.push_utf8("<![CDATA[");
+            buf.push_str(data);
+            buf.push_utf8("]]>");
+            return Ok(());
+        }
         E4XNodeKind::Element {
             children,
             attributes,

tests/tests/swfs/avm2/xml_basic/Test.as

@@ -61,6 +61,7 @@ CDATA
 ]]>;
 			
 			trace(cdata);
+			trace(cdata.toXMLString());
 			
 var declaration_doctype = new XML("<?xml version = \"1.0\" encoding = \"UTF-8\" standalone = \"yes\" ?> <!DOCTYPE person [<!ELEMENT name (#PCDATA)> ]> <p>Skipped everything else</p>");
 trace(declaration_doctype.toString());
@@ -84,4 +85,4 @@ trace(declaration_doctype.toString());
 	}
 }
 
-Test.run();
+Test.run();

tests/tests/swfs/avm2/xml_basic/output.txt

@@ -22,6 +22,10 @@ My
 Multiline
 CDATA
 
+<![CDATA[My
+Multiline
+CDATA
+]]>
 Skipped everything else
 Text after comments and PI
 Empty lists: 0 0