resolve issue #1447 (no setter for EnvironmentCamera background color) #1481
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Previously
EnvironmentCameradidn't copy the default viewport's background color, but kept an alias to the pre-existing object. To avoid unintentionally altering the default viewport, it is necessary to clone the object.EnvironmentCameraoverrides thebackGroundColorfield during initialization, so setting it any sooner would have no effect. I decided to throw anIllegalStateExceptionin that situation, to avert puzzling logic errors in apps.