[GRASS5] [bug #3042] (grass) NVIZ max PPM dump include unwanted images

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this bug's URL: http://intevation.de/rt/webrt?serial_num=3042
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Subject: NVIZ max PPM dump include unwanted images

Grass6.0beta2 from Debian testing. 
 
If I switch to another window when dumping, the dump reflects the new  
window instead of the NVIZ monitor. This should be made clear to the user  
(a "Don't move" warning). 
 
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help from Bob Covill: 
 
Minimize the main (visible) window before creating the off-screen context. 
Because of callbacks to the main window it can sometimes replace the 
off-screen context by simply moving the mouse across it. A pop-up window 
would probably be helpful in this case inform  
the user to first minmize the main window. 

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