http://bugs.winehq.org/show_bug.cgi?id=21918
--- Comment #6 from Dmitry Timoshkov dmitry@baikal.ru 2011-12-05 23:56:32 CST --- (In reply to comment #5)
Perhaps the SC_KEYMENU prohibition is no longer necessary--when I remove it from winex11, the Notepad++ bug is fixed and I haven't noticed any problems in other applications. Is the fix as simple as that?
Obviously managed windows have their own system menu (if any), which the WM provides, and activating a system menu provided by Wine is going to be really confusing. This bug is basically a wontfix.