src/vs/workbench/api/common/extHostTextEditor.ts/ExtHostTextEditorOptions/_setInsertSpaces
class ExtHostTextEditorOptions:	private _setInsertSpaces(value: boolean | string) {
		const insertSpaces = this._validateInsertSpaces(value);
		if (typeof insertSpaces === 'boolean') {
			if (this._insertSpaces === insertSpaces) {
				// nothing to do
				return;
			}
			// reflect the new insertSpaces value immediately
			this._insertSpaces = insertSpaces;
		}
		this._warnOnError('setInsertSpaces', this._proxy.$trySetOptions(this._id, {
			insertSpaces: insertSpaces
		}));
	}