On 9/21/2012 23:07, Daniel Jelinski wrote:
dwStyle is updated only in WM_STYLECHANGED, which is not sent when displaying and hiding scrollbars. Fixes the issue where there was a large margin between items and horizontal scrollbar (e.g. in file open dialog).
Are you sure it's really not supposed to be sent when WS_HSCROLL/WS_VSCROLL bits are changed? A quick test with ControlSpy shows style changing messages when I set/reset these. So it's possible there's a bug outside of comctl32.