src/vs/workbench/browser/parts/editor/editorGroupView.ts/EditorGroupView/closeEditors
class EditorGroupView:	async closeEditors(args: EditorInput[] | ICloseEditorsFilter, options?: ICloseEditorOptions): Promise<boolean> {
		if (this.isEmpty) {
			return true;
		}

		const editors = this.doGetEditorsToClose(args);

		// Check for confirmation and veto
		const veto = await this.handleCloseConfirmation(editors.slice(0));
		if (veto) {
			return false;
		}

		// Do close
		this.doCloseEditors(editors, options);

		return true;
	}