feat(rn,filmstrip) add 1on1 mode

When there are only 2 participants in a call, don't show the remote thumbnail,
unless the `disable1On1Mode` config option is set or the local participant pin
themselves.

modules/API/external/external_api.js

@@ -170,7 +170,7 @@ function parseArguments(args) {
 
     switch (typeof firstArg) {
     case 'string': // old arguments format
-    case undefined: {
+    case 'undefined': {
         // Not sure which format but we are trying to parse the old
         // format because if the new format is used everything will be undefined
         // anyway.

react/features/filmstrip/components/native/Filmstrip.js

@@ -6,12 +6,15 @@ import { SafeAreaView, ScrollView } from 'react-native';
 import { Platform } from '../../../base/react';
 import { connect } from '../../../base/redux';
 import { ASPECT_RATIO_NARROW } from '../../../base/responsive-ui/constants';
-import { isFilmstripVisible } from '../../functions';
+import { isFilmstripVisible, shouldRemoteVideosBeVisible } from '../../functions';
 
 import LocalThumbnail from './LocalThumbnail';
 import Thumbnail from './Thumbnail';
 import styles from './styles';
 
+// Immutable reference to avoid re-renders.
+const NO_REMOTE_VIDEOS = [];
+
 /**
  * Filmstrip component's property types.
  */
@@ -167,10 +170,11 @@ class Filmstrip extends Component<Props> {
  */
 function _mapStateToProps(state) {
     const { enabled, remoteParticipants } = state['features/filmstrip'];
+    const showRemoteVideos = shouldRemoteVideosBeVisible(state);
 
     return {
         _aspectRatio: state['features/base/responsive-ui'].aspectRatio,
-        _participants: remoteParticipants,
+        _participants: showRemoteVideos ? remoteParticipants : NO_REMOTE_VIDEOS,
         _visible: enabled && isFilmstripVisible(state)
     };
 }

react/features/filmstrip/functions.native.js

@@ -1,7 +1,7 @@
 // @flow
 
 import { getFeatureFlag, FILMSTRIP_ENABLED } from '../base/flags';
-import { getParticipantCountWithFake } from '../base/participants';
+import { getParticipantCountWithFake, getPinnedParticipant } from '../base/participants';
 import { toState } from '../base/redux';
 
 /**
@@ -26,3 +26,34 @@ export function isFilmstripVisible(stateful: Object | Function) {
     return getParticipantCountWithFake(state) > 1;
 }
 
+/**
+ * Determines whether the remote video thumbnails should be displayed/visible in
+ * the filmstrip.
+ *
+ * @param {Object} state - The full redux state.
+ * @returns {boolean} - If remote video thumbnails should be displayed/visible
+ * in the filmstrip, then {@code true}; otherwise, {@code false}.
+ */
+export function shouldRemoteVideosBeVisible(state: Object) {
+    if (state['features/invite'].calleeInfoVisible) {
+        return false;
+    }
+
+    // Include fake participants to derive how many thumbnails are dispalyed,
+    // as it is assumed all participants, including fake, will be displayed
+    // in the filmstrip.
+    const participantCount = getParticipantCountWithFake(state);
+    const pinnedParticipant = getPinnedParticipant(state);
+    const { disable1On1Mode } = state['features/base/config'];
+
+    return Boolean(
+        participantCount > 2
+
+            // Always show the filmstrip when there is another participant to
+            // show and the local video is pinned. Note we are not taking the
+            // toolbar visibility into account here (unlike web) because
+            // showing / hiding views in quick succession on mobile is taxing.
+            || (participantCount > 1 && pinnedParticipant?.local)
+
+            || disable1On1Mode);
+}

react/features/mobile/watchos/middleware.js

@@ -98,7 +98,7 @@ function _appWillMount({ dispatch, getState }) {
 
         switch (command) {
         case CMD_HANG_UP:
-            if (typeof getCurrentConferenceUrl(getState()) !== undefined) {
+            if (typeof getCurrentConferenceUrl(getState()) !== 'undefined') {
                 dispatch(appNavigate(undefined));
             }
             break;

resources/load-test/package-lock.json

@@ -1709,14 +1709,36 @@
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+      "version": "4.16.6",
+      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.16.6.tgz",
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-        "electron-to-chromium": "^1.3.306",
-        "node-releases": "^1.1.40"
+        "caniuse-lite": "^1.0.30001219",
+        "colorette": "^1.2.2",
+        "electron-to-chromium": "^1.3.723",
+        "escalade": "^3.1.1",
+        "node-releases": "^1.1.71"
+      },
+      "dependencies": {
+        "caniuse-lite": {
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+          "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001228.tgz",
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+          "dev": true
+        },
+        "electron-to-chromium": {
+          "version": "1.3.736",
+          "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.3.736.tgz",
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+          "dev": true
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+        "node-releases": {
+          "version": "1.1.72",
+          "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-1.1.72.tgz",
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+          "dev": true
+        }
       }
     },
     "buffer": {
@@ -1825,12 +1847,6 @@
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@@ -2049,6 +2065,12 @@
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       "dev": true
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+    "colorette": {
+      "version": "1.2.2",
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@@ -2426,12 +2448,6 @@
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@@ -2552,6 +2568,12 @@
         "is-symbol": "^1.0.2"
       }
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+    "escalade": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.1.1.tgz",
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@@ -4547,23 +4569,6 @@
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