- do not force repainting on WM_WINDOWPOSCHANGED in combobox, it
  breaks Z-order based painting.
- do nothing in the combobox WM_ERASEBKGND handler do all painting in
  WM_PAINT like Windows does.

kernel: Add tests for GetPrivateProfileSectionNames. Make behaviour the same as observed on Windows XP.

Invoke, even though we are requesting a buffer size of 0 as we put
extra data into the buffer in IRpcChannelBuffer_GetBuffer.

instead of calling I_RpcGetBuffer as IRpcChannelBuffer_GetBuffer does
some extra magic.

A main-threaded apartment is the first single-threaded apartment in the 
process. It was designed to be used for legacy applications that don't 
want to think about threading at all, even if they are always called 
from the same context, as is the case for regular STAs.

single-threaded apartment if executing in a multi-threaded apartment,
if one exists.

fixme if we should create it in an apartment of another type.