From 058f24bd7cd46b6986893da931d93422998f5dee Mon Sep 17 00:00:00 2001
From: as-op <a.sandorf@openproject.com>
Date: Wed, 4 Sep 2024 11:39:38 +0200
Subject: [PATCH] [#56779] Allow empty lines

https://community.openproject.org/work_packages/56779
---
 src/commonmark/commonmarkdataprocessor.js | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/src/commonmark/commonmarkdataprocessor.js b/src/commonmark/commonmarkdataprocessor.js
index f3c9a21..feea657 100644
--- a/src/commonmark/commonmarkdataprocessor.js
+++ b/src/commonmark/commonmarkdataprocessor.js
@@ -155,9 +155,13 @@ export default class CommonMarkDataProcessor {
 				return node.nodeName === 'FIGURE' && tables.length;
 			},
 			replacement: function (_content, node) {
-				// Remove filler nodes
-				node.querySelectorAll('td br[data-cke-filler]')
-					.forEach((node) => node.remove());
+				node.querySelectorAll('td p.op-uc-p')
+					.forEach((node) => {
+						if (node.childNodes.length === 0) {
+							node.parentElement.insertBefore(document.createElement("br"), node);
+							node.remove();
+						}
+					});
 
 				return node.outerHTML;
 			}
@@ -189,6 +193,15 @@ export default class CommonMarkDataProcessor {
 			replacement: ( _content, node ) => node.outerHTML,
 		});
 
+		turndownService.addRule( 'emptyLines', {
+			filter: (node) => {
+				console.log(node);
+				return (node.nodeName === 'BR') ||
+					(node.nodeName === 'P' && node.childNodes.length === 1 && node.childNodes[0].nodeName === 'BR');
+			},
+			replacement: ( _content, node ) => "<br>",
+		});
+
 		let turndown = turndownService.turndown( domFragment );
 		// Escape non-breaking space characters
 		return turndown.replace(/\u00A0/, '&nbsp;');