List: Unused identifiers has been removed (#30074)

Cherry pick of #30073

Author: pharret31

packages/devextreme/js/__internal/ui/list/m_list.base.ts

@@ -100,8 +100,6 @@ export class ListBase extends CollectionWidget<ListBaseProperties> {
 
   _groupRenderAction?: () => void;
 
-  _renderingGroupIndex?: unknown;
-
   _itemElementsCache!: dxElementWrapper;
 
   _isLoadIndicationSuppressed?: boolean;
@@ -1017,8 +1015,6 @@ export class ListBase extends CollectionWidget<ListBaseProperties> {
       .addClass(LIST_GROUP_HEADER_INDICATOR_CLASS)
       .prependTo($groupHeaderElement);
 
-    this._renderingGroupIndex = index;
-
     const groupBodyId = `dx-${new Guid().toString()}`;
 
     const $groupBody = $('<div>')

packages/devextreme/js/__internal/ui/list/m_list.edit.ts

@@ -284,15 +284,6 @@ class ListEdit extends ListBase {
     super._itemHoldHandler(...arguments);
   }
 
-  _getItemContainer(changeData) {
-    if (this.option('grouped')) {
-      const groupIndex = this._editStrategy.getIndexByItemData(changeData)?.group;
-      return this._getGroupContainerByIndex(groupIndex);
-    }
-    // @ts-expect-error ts-error
-    return super._getItemContainer(changeData);
-  }
-
   _itemContextMenuHandler(e): void {
     const $itemElement = $(e.currentTarget);
     if ($itemElement.is('.dx-state-disabled, .dx-state-disabled *')) {
@@ -351,7 +342,6 @@ class ListEdit extends ListBase {
         break;
       case 'grouped':
         this._clearSelectedItems();
-        delete this._renderingGroupIndex;
         this._initEditStrategy();
         super._optionChanged(args);
         break;