[Bug 20198] Help icon crashes Internet Explorer 7

http://bugs.winehq.org/show_bug.cgi?id=20198

--- Comment #7 from Juan Lang   2009-09-29 18:46:19 ---
(In reply to comment #5)
> Maybe it's altered during notification:
> TOOLBAR_SendNotify(&tbgit.hdr, infoPtr, TBN_GETINFOTIPA);

Nikolay was right.  From the +toolbar log:
trace:toolbar:TOOLBAR_SendNotify to window 0x100b0, code=fffffd32, via ANSI
trace:toolbar:TOOLBAR_TTGetDispInfo TBN_GETINFOTIPA - got string (null)

So, TBN_GETINFOTIPA/W apparently needs to handle pszText getting set to NULL. 
Tests needed, of course.