Consider the following example.
```
\paper {
left-margin = 0
}
\markup \rounded-box { foo }
\markuplist \table #'(-1) {
\rounded-box { foo }
}
```
Why is there a difference in the formatting? I would like to have the
same behaviour – ideally, `\markup` should also take the rounded box
into account while computing the horizontal extent.
Werner
