feat(virtual-background): Desktop share as virtual background wip

react/features/toolbox/components/web/Toolbox.js

  */
 type Props = {
 
+    /**
+     * String showing if the virtual background type is desktop-share.
+     */
+    _backgroundType: String,
+
     /**
      * Whether or not the chat feature is currently displayed.
      */
      * @returns {void}
      */
     _onToolbarToggleScreenshare() {
-        if (!this.props._desktopSharingEnabled) {
+        if (!this.props._desktopSharingEnabled || this.props._backgroundType === 'desktop-share') {
             return;
         }
 
         _clientWidth: clientWidth,
         _conference: conference,
         _desktopSharingEnabled: desktopSharingEnabled,
+        _backgroundType: state['features/virtual-background'].backgroundType,
         _desktopSharingDisabledTooltipKey: desktopSharingDisabledTooltipKey,
         _dialog: Boolean(state['features/base/dialog'].component),
         _feedbackConfigured: Boolean(callStatsID),