@techee, I think we're finally done with keywords. 👍

Now, on to a messier issue I just detected.

In SWI-Prolog, relational operators are prefixed with @ when used as arguments; for example, in the overloaded form of the very common sort predicate.

Visual Prolog interprets the @ token as the start of a verbatim string, and Lexilla's lexer imposes that style on every Prolog document:

        if (sc.state == SCE_VISUALPROLOG_DEFAULT) {
            if (sc.Match('@') && isOpenStringVerbatim(sc.chNext, closingQuote)) {
                sc.SetState(SCE_VISUALPROLOG_STRING_VERBATIM);

I guess Geany could always intercept or override the SCE_VISUALPROLOG_STRING_VERBATIM lexical class, or simply ignore it. In my view it's the lexer that needs adapting to comply better with the Prolog implementation that users will actually use. That said, I don't think this warrants an upstream patch, since the lexer is just working as advertised.

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