fix: Hard break serialization for commonMark (#12603)

* fix: Hard break serialization for commonMark

* tests

app/editor/extensions/ClipboardTextSerializer.ts

@@ -61,7 +61,7 @@ export default class ClipboardTextSerializer extends Extension {
                   .map((node) => ProsemirrorHelper.toPlainText(node))
                   .join("\n")
               : mdSerializer.serialize(slice.content, {
-                  softBreak: true,
+                  commonMark: true,
                 });
           },
         },

app/models/helpers/ProsemirrorHelper.ts

@@ -29,7 +29,7 @@ export class ProsemirrorHelper {
     );
 
     const markdown = serializer.serialize(doc, {
-      softBreak: true,
+      commonMark: true,
     });
     return markdown;
   };