For roomspanel, don't set `muc_domain` if its locked

CHANGES.md

 # Changelog
 
+## 4.2.1 (Unreaded)
+
+* Bugfix. Don't set `muc_domain` for roomspanel if `locked_muc_domain` is `true`.
+
 ## 4.2.0 (2019-04-04)
 
 **Note:** This release introduces a hard requirement on [MAM:2](https://xmpp.org/extensions/xep-0313.html),

src/converse-muc-views.js

@@ -269,7 +269,7 @@ converse.plugins.add('converse-muc-views', {
                 'submit form': 'showRooms',
                 'click a.room-info': 'toggleRoomInfo',
                 'change input[name=nick]': 'setNick',
-                'change input[name=server]': 'setDomain',
+                'change input[name=server]': 'setDomainFromEvent',
                 'click .open-room': 'openRoom'
             },
 
@@ -383,12 +383,12 @@ converse.plugins.add('converse-muc-views', {
             showRooms (ev) {
                 ev.preventDefault();
                 const data = new FormData(ev.target);
-                this.model.save('muc_domain', Strophe.getDomainFromJid(data.get('server')));
+                this.model.setDomain(data.get('server'));
                 this.updateRoomsList();
             },
 
-            setDomain (ev) {
-                this.model.save('muc_domain', Strophe.getDomainFromJid(ev.target.value));
+            setDomainFromEvent (ev) {
+                this.model.setDomain(ev.target.value);
             },
 
             setNick (ev) {
@@ -431,7 +431,6 @@ converse.plugins.add('converse-muc-views', {
             parseRoomDataFromEvent (form) {
                 const data = new FormData(form);
                 const jid = data.get('chatroom');
-                this.model.save('muc_domain', Strophe.getDomainFromJid(jid));
                 let nick;
                 if (_converse.locked_muc_nickname) {
                     nick = _converse.getDefaultMUCNickname();
@@ -459,6 +458,7 @@ converse.plugins.add('converse-muc-views', {
                     jid = `${Strophe.escapeNode(data.jid)}@${_converse.muc_domain}`;
                 } else {
                     jid = data.jid
+                    this.model.setDomain(jid);
                 }
                 _converse.api.rooms.open(jid, _.extend(data, {jid}));
                 this.modal.hide();
@@ -2040,7 +2040,6 @@ converse.plugins.add('converse-muc-views', {
 
 
         function setMUCDomain (domain, controlboxview) {
-            _converse.muc_domain = domain;
             controlboxview.roomspanel.model.save('muc_domain', Strophe.getDomainFromJid(domain));
         }
 

src/headless/converse-muc.js

@@ -1308,9 +1308,15 @@ converse.plugins.add('converse-muc', {
         _converse.RoomsPanelModel = Backbone.Model.extend({
             defaults: function () {
                 return {
-                    'muc_domain': '',
+                    'muc_domain': _converse.muc_domain,
                     'nick': _converse.getDefaultMUCNickname()
                 }
+            },
+
+            setDomain (jid) {
+                if (!_converse.locked_muc_domain) {
+                    this.save('muc_domain', Strophe.getDomainFromJid(jid));
+                }
             }
         });