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Digging further I found that the cause is white-space: normal css style. It is applied in the Sleek1.css.
It should be white-space:pre, as it was in the earlier versions in the epi.css stylesheed. Now it is not applied for some reason.
There now seems to be bug in the textarea editing (fields with UIHint.TextArea)
Enter key no longer produces newline in the firefox and ie11, chrome still works corectly.
Pure latest dojo versions seems to work ok.
It seems it was introduced with some of latest EPisrever releases. Somewhere between 7.16 and 7.19.
Doees anybody knows what might be the cause, and how to workaround it?