rn,participants: don't render thumbnnail for screen-shares

react/features/base/participants/components/ParticipantView.native.js

      */
     avatarSize: number,
 
+    /**
+     * Whether video should be disabled for his view.
+     */
+    disableVideo: ?boolean,
+
     /**
      * Callback to invoke when the {@code ParticipantView} is clicked/pressed.
      */
  * @returns {Props}
  */
 function _mapStateToProps(state, ownProps) {
-    const { participantId } = ownProps;
+    const { disableVideo, participantId } = ownProps;
     let connectionStatus;
     let participantName;
 
             connectionStatus
                 || JitsiParticipantConnectionStatus.ACTIVE,
         _participantName: participantName,
-        _renderVideo: shouldRenderParticipantVideo(state, participantId),
+        _renderVideo: shouldRenderParticipantVideo(state, participantId) && !disableVideo,
         _videoTrack:
             getTrackByMediaTypeAndParticipant(
                 state['features/base/tracks'],

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

 
 import { ColorSchemeRegistry } from '../../../base/color-scheme';
 import { openDialog } from '../../../base/dialog';
-import { Audio, MEDIA_TYPE } from '../../../base/media';
+import { MEDIA_TYPE, VIDEO_TYPE, Audio } from '../../../base/media';
 import {
     PARTICIPANT_ROLE,
     ParticipantView,
         const participantInLargeVideo
             = participantId === largeVideo.participantId;
         const videoMuted = !videoTrack || videoTrack.muted;
+        const isScreenShare = videoTrack && videoTrack.videoType === VIDEO_TYPE.DESKTOP;
 
         return (
             <Container
 
                 <ParticipantView
                     avatarSize = { AVATAR_SIZE }
+                    disableVideo = { isScreenShare }
                     participantId = { participantId }
                     style = { _styles.participantViewStyle }
                     tintEnabled = { participantInLargeVideo && !disableTint }