Hide members list when user enters pip.

app/src/main/java/org/thoughtcrime/securesms/WebRtcCallActivity.java

@@ -81,6 +81,7 @@ public class WebRtcCallActivity extends AppCompatActivity implements SafetyNumbe
   public static final String EXTRA_ENABLE_VIDEO_IF_AVAILABLE = WebRtcCallActivity.class.getCanonicalName() + ".ENABLE_VIDEO_IF_AVAILABLE";
 
   private CallParticipantsListUpdatePopupWindow participantUpdateWindow;
+  private CallParticipantsListDialog            participantsListDialog;
 
   private WebRtcCallView      callScreen;
   private TooltipPopup        videoTooltip;
@@ -196,6 +197,7 @@ public class WebRtcCallActivity extends AppCompatActivity implements SafetyNumbe
               .setAspectRatio(new Rational(9, 16))
               .build();
       enterPictureInPictureMode(params);
+      CallParticipantsListDialog.dismiss(getSupportFragmentManager());
       return true;
     }
     return false;

app/src/main/java/org/thoughtcrime/securesms/components/webrtc/participantslist/CallParticipantsListDialog.java

@@ -9,6 +9,7 @@ import android.view.ViewGroup;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.fragment.app.DialogFragment;
+import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentManager;
 import androidx.lifecycle.ViewModelProviders;
 import androidx.recyclerview.widget.LinearLayoutManager;
@@ -38,6 +39,13 @@ public class CallParticipantsListDialog extends BottomSheetDialogFragment {
     fragment.show(manager, BottomSheetUtil.STANDARD_BOTTOM_SHEET_FRAGMENT_TAG);
   }
 
+  public static void dismiss(@NonNull FragmentManager manager) {
+    Fragment fragment = manager.findFragmentByTag(BottomSheetUtil.STANDARD_BOTTOM_SHEET_FRAGMENT_TAG);
+    if (fragment instanceof CallParticipantsListDialog) {
+      ((CallParticipantsListDialog) fragment).dismissAllowingStateLoss();
+    }
+  }
+
   @Override
   public void show(@NonNull FragmentManager manager, @Nullable String tag) {
     BottomSheetUtil.show(manager, tag, this);