src/vs/editor/common/cursor/cursorTypeOperations.ts/TypeOperations/lineBreakInsert
class TypeOperations:	public static lineBreakInsert(config: CursorConfiguration, model: ITextModel, selections: Selection[]): ICommand[] {
		const commands: ICommand[] = [];
		for (let i = 0, len = selections.length; i < len; i++) {
			commands[i] = this._enter(config, model, true, selections[i]);
		}
		return commands;
	}