ROU-4871: Fix Dirty Mark in Action Column inside Group Columns (#408)

src/Providers/DataGrid/Wijmo/Features/DirtyMark.ts

@@ -33,18 +33,18 @@ namespace Providers.DataGrid.Wijmo.Feature {
 		private _isDirtyCell(row: number, col: number): boolean {
 			const grid = this._grid.provider;
 			if (this.hasMetadata(row)) {
+				const binding = this._grid.provider.columns[col].binding;
+				const targetColumn = this._grid.getColumn(binding);
 				let isActionColumn = false;
 
 				//If the grid is autogenerated, not need to check for action columns.
 				if (this._grid.autoGenerate === false) {
-					const targetColumn = this._grid.getColumnByIndex(col);
 					isActionColumn =
 						targetColumn && targetColumn.columnType === OSFramework.DataGrid.Enum.ColumnType.Action;
 				}
 				//only if it is a column type different from ColumnType.Action, is that
 				//we want to check the dirty mark.
 				if (isActionColumn === false) {
-					const binding = grid.getColumn(col).binding;
 					const cellValue = grid.getCellData(row, col, false);
 					const metadata = this.getMetadata(row);
 					//If the cell isNew we want to have the dirty mark