Major Description
The bug is not in our explorer.exe as it is working fine on Windows XP.
I wrote startmenu-item-context-menu-shall-open-on-rbuttonUp-instead-rbutton-down.patch
adressing our shell32, it works so far.
Although this seems like a minor thing, we need to do that correct to allow proper drag&drop in the future...
The task is basically passing the information that right mouse-button was released down into lower shell32 layers analog as it's currently done to the left button.
m_isLButtonDown in CMenuFocusManager could be eliminated currently, but I decided to leave it within as it might be useful when we add support for drag&drop in the future and to minimize the diff.
Please note, that the bug described in CORE-10829 is present with and without my patch, maybe CMenuFocusManager also is worth a second look when adressing that bug...
CC AmineKhaldi, gigaherz