private SmithyCodeWriter writeIndent() {
            setNewline("");
            // We explicitly want the trailing spaces, so disable trimming for this call.
            trimTrailingSpaces(false);
            write("");
            trimTrailingSpaces();
            setNewline("\n");
            return this;
        }
Writes an empty line that contains only indentation appropriate to the current indentation level.

<p> This does not insert a trailing newline.
smithy-model/src/main/java/software/amazon/smithy/model/shapes/SmithyIdlModelSerializer.java