Menu from menu button in titlebar opens in wrong position/direction on multiscreen setup

[mlx]

Kubuntu Quantal (12.10) amd64, stock KDE packages.

Description: The menu that is opened by the "menu" button in the window titlebar (this button has the icon of a particular application, to which the window belongs, and is the left-most button in default Kubuntu setup) is positioned wrong on bottom monitor in a multi-monitor setup.

Preconditions:
The monitor setup is: laptop screen under an external monitor connected over VGA:
xrandr --output VGA1 --auto
xrandr --output LVDS1 --auto --below VGA1

Replication/problem: Move a window (any window) to the laptop screen, then click on the menu button. If there's enough space above the button to display the entire menu, it's displayed upwards of the button. If there isn't enough space, it's displayed on the VGA monitor.

Expected behaviour: The menu should be displayed downwards, unless there's not enough space on the screen where the button is actually located.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: kde-window-manager 4:4.9.2-0ubuntu2.1
Uname: Linux 3.7.0-030700rc2-generic x86_64
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
Date: Thu Nov 1 16:37:21 2012
InstallationDate: Installed on 2012-10-28 (3 days ago)
InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.1)
MarkForUpload: True
SourcePackage: kde-workspace
UpgradeStatus: No upgrade log present (probably fresh install)

[Harald Sitter (apachelogger)]

can you reproduce this with the oxygen window decoration?

[mlx (myxal-mxl)]

Yes, occurs with Oxygen theme as well

[Launchpad Janitor (janitor)]

[Expired for kde-workspace (Ubuntu) because there has been no activity for 60 days.]