KDE version: 4.13.3 (was not an option above so I write it here)

Auto-hidden panel hides mouse clicks at the bottom of the screen in full screen applications.

Reproducible: Always

Steps to Reproduce:
1. Set auto hide: Right-click panel -> Panel options -> Panel Settings -> More settings -> click Auto hide

2. Panel should be at the bottom of the screen (didn't try any other location)

3. Start eg. Firefox and press F11 to enter full screen mode

Actual Results:  
Now clicks and other mouse events aren't recognized by the app (eg. Firefox). Try clicking a link that's at the bottom of the screen or try to select text that's at the bottom of the screen. It won't work.

Expected Results:  
Mouse events from anywhere on the screen should be sent to the full screen application.

If you don't auto-hide the panel, it works as expected.