http://bugs.winehq.org/show_bug.cgi?id=16183
--- Comment #4 from Ben Byer winehq@bbyer.mm.st 2009-06-10 13:59:23 --- I talked to the developer of IDA Pro about this (Hex-Rays), and they said that it might be a problem with Borland VCL (the application is compiled with C++ Builder 6.0). The code in the MouseWheel handler is just calling CalcHintRect and ActivateHintData for every mousewheel event, if that helps someone create a test case.