add last bbcode text to last unclosed node

plugins/rss/init.js

@@ -1336,9 +1336,8 @@ theWebUI.mapBBCodeToHTML = function (htmlText) {
 		}
 		offset = match.index + match[0].length;
 	}
-	const rootNode = nodeStack[0];
-	rootNode.children.push(htmlText.substring(offset, htmlText.length));
-	const htmlContent = nodeToElement(rootNode).innerHTML;
+	nodeStack[nodeStack.length-1].children.push(htmlText.substring(offset, htmlText.length));
+	const htmlContent = nodeToElement(nodeStack[0]).innerHTML;
 
 	// Support for some emoticons from WhatCD/Gazelle (https://github.com/WhatCD/Gazelle/tree/master/static/common/smileys)
 	// :code: => utf8 emoticon (https://utf8-icons.com/subset/emoticons)

tests/plugins/rss/init.spec.js

@@ -41,10 +41,19 @@ correctContent();
 document.body.appendChild($("<div>").attr("id", "rsslayout")[0]);
 
 describe("rss details", () => {
-  afterEach(() => {
+  beforeEach(() => {
     $("#rsslayout").text("");
   });
 
+  it("should handle incomplete or faulty bbcode", () => {
+    expect(theWebUI.mapBBCodeToHTML("[i]ABC[/i]abc[b]CDE")).toEqual(
+      "<i>ABC</i>abc<b>CDE</b>"
+    );
+    expect(theWebUI.mapBBCodeToHTML("[i]ABC[/i]abc[b]CDE[/c]some")).toEqual(
+      "<i>ABC</i>abc<b>CDE[/c]some</b>"
+    );
+  });
+
   it("should map emoticons to html", () => {
     const bbcode =
       "[center  ][color=red ]Important :smile::shifty:[/color][/center]";