Desktop: WYSIWYG: Preserve HTML code in Markdown when editing from wysiwyg editor

ReactNativeClient/lib/joplin-renderer/htmlUtils.js

@@ -70,7 +70,13 @@ class HtmlUtils {
 		return selfClosingElements.includes(tagName.toLowerCase());
 	}
 
-	sanitizeHtml(html) {
+	sanitizeHtml(html, options = null) {
+		options = Object.assign({}, {
+			// If true, adds a "jop-noMdConv" class to all the tags.
+			// It can be used afterwards to restore HTML tags in Markdown.
+			addNoMdConvClass: false,
+		}, options);
+
 		const htmlparser2 = require('htmlparser2');
 
 		const output = [];
@@ -95,6 +101,15 @@ class HtmlUtils {
 				for (const eventName of JS_EVENT_NAMES) {
 					delete attrs[eventName];
 				}
+
+				if (options.addNoMdConvClass) {
+					let classAttr = attrs['class'] || '';
+					if (!classAttr.includes('jop-noMdConv')) {
+						classAttr += ' jop-noMdConv';
+						attrs['class'] = classAttr.trim();
+					}
+				}
+
 				let attrHtml = this.attributesHtml(attrs);
 				if (attrHtml) attrHtml = ` ${attrHtml}`;
 				const closingSign = this.isSelfClosingTag(name) ? '/>' : '>';