[VB]	Public Sub validateViewPort()
[C#]	public void validateViewPort();

Ensures the view port left, top, width and height are within valid ranges and adjusts them if necessary.

The valid ranges of the view port width and height should be 0 to 1. The view port left should be in between 0 and (1 - view port width). The view port top should be in between 0 and (1 - view port height).

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