Set the gap between true ceiling and false ceiling when extruding

Use extrude depth for the false ceiling thickness and front shift for how far it hangs below the true ceiling.

1. When extruding a false ceiling, the depth value sets the thickness of the false ceiling.

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2. When extruding a false ceiling, the front shift value sets how far down from the true ceiling the false ceiling hangs.

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3. A front shift of 100 mm leaves a 100 mm gap between the true ceiling and the false ceiling.

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4. A front shift of zero makes it touch the true ceiling.

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