Resize Tiles To Smallest Common Size

I find the Resize Tiles function in PyxelEdit quite helpful; what would be even more helpful would be an algorithm that finds the smallest tile dimensions which preserve colored-in pixels among all tiles, then resizes the tiles to those dimensions--in essence, a "crop out unused space" function.

This would allow users to create pixel animations within large tiles, using as much space as they need, and then later easily reduce the image size to the smallest dimensions necessary to render every frame, saving a lot of time on optimization.