http://bugs.winehq.org/show_bug.cgi?id=20570
--- Comment #3 from Bruno Jesus 00cpxxx@gmail.com 2011-09-03 17:08:30 CDT --- Created an attachment (id=36218) --> (http://bugs.winehq.org/attachment.cgi?id=36218) Compiled test
This is fixed by http://source.winehq.org/git/wine.git/commit/7c76a79ffa199c892f9d555bc12e2dd...
I have added several different tests to wine and the attached .exe can be used to test too. Press combobox down button and you will see a list of items that has the same size from the combobox, then use the button below to change the combobox dropped size to 100, reopen the combobox and you will see it's larger =)
It's possible to try setting any other value too in the bottom-left textbox.