Have you ever tried to copy an image in Gimp and open a new image to paste it into? Then you’ve probably noticed that the size of that new image isn’t automatically adjusted to the size of the image in your clipboard - like it is in Photoshop or in earlier versions of Gimp.
However, a new and simpler feature has replaced the automatic image size in Gimp. That is “Paste into image”. This is easily done by going to Edit -> Paste as -> New Image, as you see in the screenshot below, or simply by pressing Ctrl + Shift + V.