reproducible with 070212

if I generate javadoc for class which
has several lines of comments in source, all lines will be formatted as one line
if no html format specified in comments.

In my opinion correct behavior is:
1. multiline entered in documentation customizer should be should as one line in
documentation window and if user want to see new line in documentation window
<br>  should be added explicitly
2. if user enter several lines in documentation window we should form
documentation property with appropriate '<br>' html tag

see also Issue 89650,

- cureently we will have different result in javadoc generated for generated
code and in our javadoc-like report
- As for allowing plain text edition of documentation it's ok, for example user
can edit html page in notepad, but if user make newlines without <br> (i.e. just
by pressing enter) he'll get may be unexpected result in browser/