Trimming text before computing width should be optional.

[jay-jlm]

For my use case I need to the metrics to include whitespace characters in the of the string.
Currently does not seem to be possible, since it calls .trim() on the string before computing the results.

[bezoerb]

This is because the whitespaces normally collapse. If you like you could do a PR making this configurable using the current behavior as default?