ListGridFieldType enum seems indeed to be missing, but I can't find it either in the SmartClient docs.
But it does exist as a a framework type:
You can see it when you assign a datasource to a grid, having a datasourcefield of type FieldType.ENUM. After that, call grid.getFields() and check the type attribute of those fields, result is: com.smartgwt.client.widgets.grid.ListGridField.type = enum java.lang.String
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