src/vs/workbench/api/common/extHostTextEditors.ts/ExtHostEditors/getVisibleTextEditors
class ExtHostEditors:	getVisibleTextEditors(internal?: true): ExtHostTextEditor[] | vscode.TextEditor[] {
		const editors = this._extHostDocumentsAndEditors.allEditors();
		return internal
			? editors
			: editors.map(editor => editor.value);
	}