Photoshop for All: [Adobe_Photoshop_Techniques] How keep Gaussian Blur from leaking?

Say I have an image with a sharp foreground object and I want to blur the background. I start with a selection of the background and blur it using Gaussian Blur.

The problem is that the blur incorporates colors/luminance from the masked areas. There is even luminance leakage when the masked area is empty. The result is a halo around the foreground object.

My question - how do I avoid the leakage halo?

Thanks, susan

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