feat(editor): rewrite <s> to <del>

packages/ckeditor5-build-trilium/src/config.ts

@@ -78,6 +78,7 @@ import '../../ckeditor5-footnotes/src/footnote.css';
 import { Footnotes } from '../../ckeditor5-footnotes';
 import Kbd from "../../ckeditor5-keyboard-marker/src/Kbd";
 import { Admonition } from "../../ckeditor5-admonition";
+import StrikethroughAsDel from './strikethrough_as_del';
 
 export const COMMON_PLUGINS = [
 	// essentials package expanded to allow selectively disable Enter and ShiftEnter
@@ -136,6 +137,7 @@ export const COMMON_PLUGINS = [
 	Mention,
 	InternalLinkPlugin,
 	ItalicAsEmPlugin,
+	StrikethroughAsDel,
 	MarkdownImportPlugin,
 	CuttonotePlugin,
 	MentionCustomization,

packages/ckeditor5-build-trilium/src/strikethrough_as_del.ts

@@ -0,0 +1,15 @@
+import Plugin from '@ckeditor/ckeditor5-core/src/plugin';
+
+export default class StrikethroughAsDel extends Plugin {
+
+	init() {
+		this.editor.conversion
+			.for("downcast")
+			.attributeToElement({
+				model: "strikethrough",
+				view: "del",
+				converterPriority: "high"
+			});
+	}
+
+}