[IDEA] App that sets Full Brightness when Charging/Dims when not charging

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Im not sure if this has been implemented or not, but if it hasnt, I think itd be awesome to have an app that sets the screen to full brightness whenever the phone is charging, and when you unplug the phone from the charger it resets the brightness back to the setting you had before...is there anything like this? If not I think there should be

Power Manager... available in the market.

Locale... but will need to lockscreen/unlock for settings to take effect