src/vs/workbench/services/model/common/modelService.ts/WorkbenchModelService/_schemaShouldMaintainUndoRedoElements
class WorkbenchModelService:	protected override _schemaShouldMaintainUndoRedoElements(resource: URI) {
		return (
			super._schemaShouldMaintainUndoRedoElements(resource)
			|| resource.scheme === this._pathService.defaultUriScheme
		);
	}