fix empty lines lost on reload

Author: ComputelessComputer

src/components/editor/extensions/paragraph/ParagraphExtension.ts

@@ -1,10 +1,32 @@
 import { Paragraph, } from "@tiptap/extension-paragraph";
 
+const EMPTY_MARKER = "\u200B";
+
 export const CustomParagraph = Paragraph.extend({
+  parseMarkdown: (token, helpers,) => {
+    const tokens = token.tokens || [];
+
+    if (tokens.length === 1 && tokens[0].type === "image") {
+      return helpers.parseChildren([tokens[0],],);
+    }
+
+    const content = helpers.parseInline(tokens,);
+
+    if (
+      content.length === 1
+      && content[0].type === "text"
+      && (content[0].text === EMPTY_MARKER || content[0].text === " " || content[0].text === "\u00A0")
+    ) {
+      return helpers.createNode("paragraph", undefined, [],);
+    }
+
+    return helpers.createNode("paragraph", undefined, content,);
+  },
+
   renderMarkdown: (node, helpers,) => {
     const content = helpers.renderChildren(node.content || [],);
     if (content === "") {
-      return "\u200B\n\n";
+      return `${EMPTY_MARKER}\n\n`;
     }
     return `${content}\n\n`;
   },