FIX: Nested quotes weren't rendered properly with BBCode

app/assets/javascripts/pretty-text/engines/discourse-markdown/bbcode.js.es6

@@ -9,6 +9,8 @@ export function register(helper, codeName, args, emitter) {
     start: new RegExp("\\[" + codeName + "(=[^\\[\\]]+)?\\]([\\s\\S]*)", "igm"),
     stop: new RegExp("\\[\\/" + codeName + "\\]", "igm"),
     emitter(blockContents, matches) {
+
+
       const options = helper.getOptions();
       while (blockContents.length && (typeof blockContents[0] === "string" || blockContents[0] instanceof String)) {
         blockContents[0] = String(blockContents[0]).replace(/^\s+/, '');
@@ -22,7 +24,11 @@ export function register(helper, codeName, args, emitter) {
       let contents = [];
       if (blockContents.length) {
         const nextContents = blockContents.slice(1);
-        blockContents = this.processBlock(blockContents[0], nextContents).concat(nextContents);
+        blockContents = this.processBlock(blockContents[0], nextContents);
+
+        nextContents.forEach(nc => {
+          blockContents = blockContents.concat(this.processBlock(nc, []));
+        });
 
         blockContents.forEach(bc => {
           if (typeof bc === "string" || bc instanceof String) {

app/assets/javascripts/pretty-text/engines/discourse-markdown/quote.js.es6

@@ -10,6 +10,7 @@ registerOption((siteSettings, opts) => {
 
 export function setup(helper) {
   register(helper, 'quote', {noWrap: true, singlePara: true}, (contents, bbParams, options) => {
+
     const params = {'class': 'quote'};
     let username = null;
     const opts = helper.getOptions();

test/javascripts/lib/pretty-text-test.js.es6

@@ -220,6 +220,11 @@ test("Quotes", function() {
                 "<p>1</p>\n\n<aside class=\"quote\" data-post=\"1\"><div class=\"title\"><div class=\"quote-controls\"></div>bob:" +
                 "</div><blockquote><p>my quote</p></blockquote></aside>\n\n<p>2</p>",
                 "includes no avatar if none is found");
+
+  cooked(`[quote]\na\n\n[quote]\nb\n[/quote]\n[/quote]`,
+         "<p><aside class=\"quote\"><blockquote><p>a</p><p><aside class=\"quote\"><blockquote><p>b</p></blockquote></aside></p></blockquote></aside></p>",
+         "handles nested quotes properly");
+
 });
 
 test("Mentions", function() {