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

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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