http://bugs.winehq.org/show_bug.cgi?id=18647
--- Comment #14 from Roderick Colenbrander thunderbird2k@gmail.com 2010-05-07 09:12:36 --- I don't have Windows by hand right now but as far as I remember the behavior on Windows is that when you click on the 'text field' while the line doesn't have focus, the text field becomes editable. On Wine, the first click on the text field selects the row and the second makes the text field editable.
A second problem in the sample seems to be that after you have edited the text field, the text in the first column disappears. When you select the row again (which forces a refresh) it appears again.