🐛 Bug fixes of duplication

lib/screens/chat/call.dart

@@ -277,6 +277,14 @@ class _ChatCallState extends State<ChatCall> {
         }
       }
     }
+
+    var checklistIdx = List<String>.empty(growable: true);
+    userMediaTracks = userMediaTracks.where((element) {
+      if(checklistIdx.contains(element.participant.sid)) return false;
+      checklistIdx.add(element.participant.sid);
+      return true;
+    }).toList();
+
     setState(() {
       _participantTracks = [...screenTracks, ...userMediaTracks];
     });
@@ -403,18 +411,25 @@ class _ChatCallState extends State<ChatCall> {
                 right: 0,
                 top: 0,
                 child: SizedBox(
-                  height: 120,
+                  height: 120 + 16,
                   child: ListView.builder(
                     scrollDirection: Axis.horizontal,
                     itemCount: math.max(0, _participantTracks.length - 1),
-                    itemBuilder: (BuildContext context, int index) => SizedBox(
+                    itemBuilder: (BuildContext context, int index) => Padding(
+                      padding: const EdgeInsets.all(8.0),
+                      child: ClipRRect(
+                        borderRadius: const BorderRadius.all(Radius.circular(8)),
+                        child: Container(
                           width: 120,
                           height: 120,
+                          color: Theme.of(context).cardColor,
                           child: ParticipantWidget.widgetFor(_participantTracks[index + 1]),
                         ),
                       ),
                     ),
                   ),
+                ),
+              ),
             ],
           );
         },