fix: disable escaping when serializing content for code_block (#537)

Author: d3m1d0v

src/core/markdown/MarkdownSerializer.js

@@ -165,7 +165,7 @@ export class MarkdownSerializerState {
             const startOfLine = this.atBlank() || this.closed;
             this.write();
             let text = lines[i];
-            if (escape !== false) text = this.esc(text, startOfLine)
+            if (escape !== false && this.options.escape !== false) text = this.esc(text, startOfLine)
             if (this.escapeWhitespace) text = this.escWhitespace(text);
             this.out += text
             if (i != lines.length - 1) this.out += '\n';

src/extensions/markdown/CodeBlock/commands.ts

@@ -28,7 +28,7 @@ export const setCodeBlockType =
         if (!setBlockType(nodeType)(state)) return false;
 
         if (dispatch) {
-            const markup = serializer.serialize(state.selection.content().content);
+            const markup = serializer.serialize(state.selection.content().content, {escape: false});
             dispatch(
                 state.tr.replaceSelectionWith(
                     nodeType.createAndFill({}, markup ? state.schema.text(markup) : null)!,