corset

I have recorded a video that i think can better explain what i meant. I set the ratio to 1:1, it works fine before reach the edge. https://streamable.com/fmtbi Thx

For the rect select tool, I have set to Fixed Ratio mode. However, when the selection area reach the edge of image, the selected area will loose the setting ratio and increase at non-edge side. Is there an option can make it done like in ps that if one side reach an edge, the area will not increase any more? Thank you.