Don't fold list nodes

FIX: Disable folding for list nodes (since it will shadow the folding on the first
list item).

See https://discuss.codemirror.net/t/interesting-list-folding-behavior/8021/3

src/markdown.ts

@@ -10,7 +10,7 @@ const headingProp = new NodeProp<number>()
 const commonmark = baseParser.configure({
   props: [
     foldNodeProp.add(type => {
-      return !type.is("Block") || type.is("Document") || isHeading(type) != null ? undefined
+      return !type.is("Block") || type.is("Document") || isHeading(type) != null || isList(type) ? undefined
         : (tree, state) => ({from: state.doc.lineAt(tree.from).to, to: tree.to})
     }),
     headingProp.add(isHeading),
@@ -28,6 +28,10 @@ function isHeading(type: NodeType) {
   return match ? +match[1] : undefined
 }
 
+function isList(type: NodeType) {
+  return type.name == "OrderedList" || type.name == "BulletList"
+}
+
 function findSectionEnd(headerNode: SyntaxNode, level: number) {
   let last = headerNode
   for (;;) {