Revert "drop: debug."

This reverts commit 7d48ea1bca.

conference.js

@@ -2069,7 +2069,8 @@ export default {
     _initDeviceList(setDeviceListChangeHandler = false) {
         const { mediaDevices } = JitsiMeetJS;
 
-        if (mediaDevices.isDeviceChangeAvailable()) {
+        if (mediaDevices.isDeviceListAvailable()
+                && mediaDevices.isDeviceChangeAvailable()) {
             if (setDeviceListChangeHandler) {
                 this.deviceChangeListener = devices =>
                     window.setTimeout(() => this._onDeviceListChanged(devices), 0);

modules/API/external/external_api.js

@@ -11,6 +11,7 @@ import {
     getAvailableDevices,
     getCurrentDevices,
     isDeviceChangeAvailable,
+    isDeviceListAvailable,
     isMultipleAudioInputSupported,
     setAudioInputDevice,
     setAudioOutputDevice,
@@ -988,15 +989,10 @@ export default class JitsiMeetExternalAPI extends EventEmitter {
      * Returns Promise that resolves with true if the device list is available
      * and with false if not.
      *
-     * @deprecated
-     *
      * @returns {Promise}
      */
     isDeviceListAvailable() {
-        console.warn('isDeviceListAvailable is deprecated and will be removed in the future. '
-                     + 'It always returns true');
-
-        return Promise.resolve(true);
+        return isDeviceListAvailable(this._transport);
     }
 
     /**

modules/API/external/functions.js

@@ -56,6 +56,21 @@ export function isDeviceChangeAvailable(transport, deviceType) {
     });
 }
 
+/**
+ * Returns Promise that resolves with true if the device list is available
+ * and with false if not.
+ *
+ * @param {Transport} transport - The @code{Transport} instance responsible for
+ * the external communication.
+ * @returns {Promise}
+ */
+export function isDeviceListAvailable(transport) {
+    return transport.sendRequest({
+        type: 'devices',
+        name: 'isDeviceListAvailable'
+    });
+}
+
 /**
  * Returns Promise that resolves with true if multiple audio input is supported
  * and with false if not.

react/features/base/devices/actions.web.ts

@@ -150,7 +150,8 @@ export function getAvailableDevices() {
     return (dispatch: IStore['dispatch'], getState: IStore['getState']) => new Promise(resolve => {
         const { mediaDevices } = JitsiMeetJS;
 
-        if (mediaDevices.isDeviceChangeAvailable()) {
+        if (mediaDevices.isDeviceListAvailable()
+                && mediaDevices.isDeviceChangeAvailable()) {
             mediaDevices.enumerateDevices((devices: MediaDeviceInfo[]) => {
                 const { filteredDevices, ignoredDevices } = filterIgnoredDevices(devices);
                 const oldDevices = flattenAvailableDevices(getState()['features/base/devices'].availableDevices);

react/features/device-selection/functions.web.ts

@@ -163,8 +163,7 @@ export function processExternalDeviceRequest( // eslint-disable-line max-params
 
     switch (request.name) {
     case 'isDeviceListAvailable':
-        // TODO(saghul): remove this, eventually.
-        responseCallback(true);
+        responseCallback(JitsiMeetJS.mediaDevices.isDeviceListAvailable());
         break;
     case 'isDeviceChangeAvailable':
         responseCallback(