Wrong resolution when using "same screen" option

I am using a laptop with an external monitor.

Laptop LCD: 1440x900 max
External (VGA): 1920x1080 max

Reproduce bug:
1.) Open LXRandR
2) Click on "Show the same screen on both Laptop LCD and external monitor"

Expected behaviour:
LXRandR chooses a resolution for both screens that the lower one can show the full desktop

What happens:
LXRandR applies the maximal resolution and "cuts" the screen on the lower resolution device

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: lxrandr 0.1.2-3
ProcVersionSignature: Ubuntu 3.8.0-27.40-generic 3.8.13.4
Uname: Linux 3.8.0-27-generic i686
ApportVersion: 2.9.2-0ubuntu8.1
Architecture: i386
Date: Sun Aug 11 17:26:48 2013
MarkForUpload: True
SourcePackage: lxrandr
UpgradeStatus: No upgrade log present (probably fresh install)
xrandr_output: Error: [Errno 2] No such file or directory: 'udisks'