latex linebreak error due to change to one box

[Ioannis Filippidis]

inkscape 0.91 r13725 breaks the latex export, because it exports newline characters within a textbox as:

```
\put(0.94402477,0.15215056){\color[rgb]{0,0,0}\makebox(0,0)[lb]{\smash{a\\ b}}}%
```

instead of:

```
\put(0.94403285,0.15221097){\color[rgb]{0,0,0}\makebox(0,0)[lb]{\smash{a
b}}}%
```

which is what inkscape 0.48.5 r10040 does, and LaTeX is happy.
With the first one I get the LaTeX error:

`! LaTeX Error: Something's wrong--perhaps a missing \item.`