Merge pull request #926 from jitsi/lock-fixes

Changes the state of room locker if room was locked not by current user.

conference.js

             console.log("Received channel password lock change: ", state,
                 error);
             APP.UI.markRoomLocked(state);
+            roomLocker.lockedElsewhere = state;
         });
 
         room.on(ConferenceEvents.USER_STATUS_CHANGED, function (id, status) {

modules/UI/authentication/RoomLocker.js

     let password;
     let dialog = null;
 
+    /**
+     * If the room was locked from someone other than us, we indicate it with
+     * this property in order to have correct roomLocker state of isLocked.
+     * @type {boolean} whether room is locked, but not from us.
+     */
+    let lockedElsewhere = false;
+
     function lock (newPass) {
         return room.lock(newPass).then(function () {
             password = newPass;
      */
     return {
         get isLocked () {
-            return !!password;
+            return !!password || lockedElsewhere;
         },
 
         get password () {
             return password;
         },
 
+        /**
+         * Sets that the room is locked from another user, not us.
+         * @param {boolean} value locked/unlocked state
+         */
+        set lockedElsewhere (value) {
+            lockedElsewhere = value;
+        },
+
+        /**
+         * Whether room is locked from someone else.
+         * @returns {boolean} whether room is not locked locally,
+         * but it is still locked.
+         */
+        get lockedElsewhere () {
+            return lockedElsewhere;
+        },
+
         /**
          * Allows to remove password from the conference (asks user first).
          * @returns {Promise}
                 dialog = null;
             };
 
-            if (password) {
+            if (this.isLocked) {
                 dialog = APP.UI.messageHandler
                     .openMessageDialog(null, "dialog.passwordError",
                         null, null, closeCallback);