Add docstrings

src/converse-chatboxes.js

@@ -117,6 +117,17 @@
                 },
 
                 getMessageAttributes (message, delay, original_stanza) {
+                    /* Parses a passed in message stanza and returns an object
+                     * of attributes.
+                     *
+                     * Parameters:
+                     *    (XMLElement) message - The message stanza
+                     *    (XMLElement) delay - The <delay> node from the
+                     *      stanza, if there was one.
+                     *    (XMLElement) original_stanza - The original stanza,
+                     *      that contains the message stanza, if it was
+                     *      contained, otherwise it's the message stanza itself.
+                     */
                     delay = delay || message.querySelector('delay');
                     const type = message.getAttribute('type'),
                         body = this.getMessageBody(message);
@@ -157,6 +168,9 @@
                 },
 
                 createMessage (message, delay, original_stanza) {
+                    /* Create a Backbone.Message object inside this chat box
+                     * based on the identified message stanza.
+                     */
                     return this.messages.create(this.getMessageAttributes.apply(this, arguments));
                 },
 
@@ -257,6 +271,9 @@
                 onMessage (message) {
                     /* Handler method for all incoming single-user chat "message"
                      * stanzas.
+                     *
+                     * Parameters:
+                     *    (XMLElement) message - The incoming message stanza
                      */
                     let contact_jid, delay, resource,
                         from_jid = message.getAttribute('from'),

src/converse-chatview.js

@@ -946,7 +946,9 @@
                 },
 
                 renderToolbar (toolbar, options) {
-                    if (!_converse.show_toolbar) { return; }
+                    if (!_converse.show_toolbar) {
+                        return this;
+                    }
                     toolbar = toolbar || tpl_toolbar;
                     options = _.assign(
                         this.model.toJSON(),