Version:            (using KDE 4.4.1)
Installed from:    openSUSE RPMs

I do have some windows open with a long title in the title-bar.
For instance okular, which shows the name of the document in the title-bar. When this name
is very long, the string in title-bar will be long.

Now when I open the right-click menu of a titlebar of a window, and I do this closely to the right screen edge, this problem occurs:

 -- The space between the right border of the sub menu and the right screen edge is 
    not big enough to fit the long window titles.
 -- Therefore if I choose "Move window to group" submenu, the shown list of window titles
    overlaps the right click menu.
 -- This only happens the first time in the lifetime of the right click menu. If I move
    my mouse to another menu entry and then back to "Move window to group", the appearing
    list will be now aligned to the left border of the right-click menu where is enough 
    space to allow the list not to overlap over right-click menu.
 
Note that this problem of the content of a submenu overlapping the right-click menu only 
happens with the "Move window to group" submenu -- all other submenus align their 
content to the left border if there is not enough space btw. the right border of right-click menu and the right screen edge.

The problem with this bug is a usability one: Because if I don't want to select "Move window to group" but a entry below in the right-click menu, it can happen that I first point my mouse a little bit to far above and the "Move window to group" submenu occurs and hides the entries below. Therefore one has to move mouse pointer upwards to get rid of this menu and then try again to hit the wished for entry. 
It's not that big of a deal, but sometimes rather annoying.

If my explanation is not clear, or easily reproduceable, I could also provide screenshots.