I just found that a behavior in importing from latex is not expected.

```
(define from "latex-snippet")
(define to "texmacs-stree")
(convert "$a b$" "latex-snippet" "texmacs-stree")
```

The code means that importing math formula `$a b$`

from latex to texmacs. The result has an extra `*`

in between. The result is `(math "a*b")`

, what I really want is `(math "a b")`

. Anyone knows how to change this behavior?