Macroniser destroys formatting

[johnlawrenceaspden]

When using the web page (http://www.alatius.com/macronizer/), if you put in text with formatting:

puella
puer
amatur

then the macronised display looks right:

puella
puer
amātur

but when you copy the text back, either using the button or just selecting the text, all the newlines go missing and you get:

puella puer amātur

I can't see any way to recover the formatting whilst keeping the macrons.

(I'm using debian and firefox in case that matters)

P.S. utterly love macroniser, thank you!