[Bug 43465] New: Unit Test: ComboBox Dropdown does not work if Style is set and no scrollbar required

https://bugs.winehq.org/show_bug.cgi?id=43465

Bug ID: 43465
           Summary: Unit Test: ComboBox Dropdown does not work if Style is
                    set and no scrollbar required
           Product: Wine
           Version: 2.13
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 58840
  --> https://bugs.winehq.org/attachment.cgi?id=58840
Image of Visual bug

winehq-devel

wine --version
wine-2.13

Combox works without the style loaded.
After Style is loaded 
The dropdown box is blank and not selectable.
works if scroll bar is required and the dropdown count >5.

source code is available
download unit test

http://www.ateksol.com/dev/unittest/CreateComboBox.exe
sha1sum
bc58c1ec276cdf492133b5005690040ce7f3bfad  CreateComboBox.exe

I put unknown in Component because we have tried native
comctl32,comdlg32,advapi32,uxtheme,msimg32,MSCTF

I set the priority a Normal however for our release of the product it is 
Blocker.

Attached is an image of the symptom.

If it helps the above referenced program has a button to create and drop down a
new box.

The CreateCombo button Sleeps for 10 seconds to allow time to start trace
Creates the compontent drops it down and sleeps for 5 seconds to stop the
trace.