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Let callers ask the speller whether a string is an entry When a word is misspelled, LibreOffice re-checks it joined with a neighbour ("okta okta") to find multi-word dictionary entries, and drops the underline if that comes back valid. Running the pipeline cannot answer that: it tokenises the string and only reports that each token is spelled correctly. So the extension rejects any input with whitespace in it, which underlines the first word of real multi-word entries (divvunspell-libreoffice#13). The cgspell acceptor can answer it directly. Add Cgspell::is_correct, which looks the string up with is_correct_with_config under cgspell's own config, so recasing behaves as it does in the pipeline, and expose it as DRT_Bundle_isCorrect. cffi's BoolMarshaler has no fallible form, so a small BoolResultMarshaler reports errors through the callback and returns false. A character outside the acceptor's alphabet maps to its unknown symbol, or to epsilon when it has none, so a space could match where the acceptor has no space at all. Refuse strings with a space outright when " " is not in the alphabet, and refuse any other whitespace always: LibreOffice joins with a plain space. Against se.drb, whose acceptor has " " as a symbol: "sápmelaš", "dan dihte", "juohke sajis", "New York" and "Sri Lanka" are entries; "sápmelas", "okta okta", "Mun Mun", "dihte dan", "dan dihte" and "dan dihte" with a no-break space are not. The cgspell_is_correct example runs the same lookup from the command line.