Textarea field does not show line breaks in preview mode

• run the quickstart war
• log in as admin
• browse to documents -> articles -> myarticle2
• click "edit"
• in the "introduction" field, type some text that includes line breaks, e.g.:

line one
line two

line four

• now click "done"
• the introduction field will show the text you entered without line breaks, e.g. "line one line two line four"