tested ros gcc dbg 0.4.8-dev-450.
In explorer file browser there is an addressbar.
When addressbar is collapsed state it must not receive any mouse scroll events.
It receives scroll events even in collapsed state.
This is not only very unintuitive, but it may even crash explorer as can be seen in video.webm.
In 0.4.8-dev-450-gad181d8.log the crash happened right above
(../win32ss/user/ntuser/message.c:1264) err: Attempted to post message to window 003C0104 when the thread is in cleanup!