Version:           unspecified (using KDE 4.6.0) 
OS:                Linux

With kde-4.5.5 when I booted my laptop without the external monitor connected, the panel was resized to the resolution of the laptop's internal monitor.

With kde-4.6 the panel stays 1920px long, although my internal monitor is only 1280px, therefor all elements on the right (systray) are hidden.
Because the config-cashew is located right too, I can't even resize the panel.

In the long term KDE should provide an option to stretch the panel to monitor size always.

Reproducible: Always

Steps to Reproduce:
1. Start with an external monitor connected (that has higher resolution than internal one)
2. Resize the panel to monitor's size
3. Restart with external monitor disconnected

Actual Results:  
Panel still as large as external monitor, systray and config-cashew not visible

Expected Results:  
Panel should resize to monitor's size. 

Furthermore there should be an option to automatically make the panel take the whole monitor with or height. This would make it a lot more comfortable for KDE users with changing monitors.