Resize canvas size to image or layer size in GIMP

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Scenario

I copied a layer from another image file , and created a empty canvas to hold the image copied.

But when I create the new canvas, the default size was as same as the original canvas , where I copied this layer.

How can I resize the canvas size to exactly the size of the image I copied? As you can see , it's already under selection , maybe there's some way out from here.

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