Sometimes, optimized line breaking outputs lines that are wider
than the allotted width so that spacing between words can be
narrowed to fit. However, the width calculation for the fit-to-width
case does not account for this, causing the resulting width to exceed
the width of the region. This commit takes the minimum of the
calculated width with the width of the region. Fixes#1825.
This positions placed elements relative to the real container size instead of relative to the base size of the region. This makes its usage more versatile.
Fixes#82Fixes#685Fixes#1705
