Image or Photo Mgmt App - 2 visible open images in same frame

Cross posted from linux mint forum, where no response was received. My workflow involves having multiple images open and simultaneously visible and editable, in a single frame, in a single instance of the application. This allows me to paste back and forth between images, without having to (in effect) make the image in a tab visible. My workflow also involves being able to copy an on-focus image, and then paste it into a new image "automatically" (again in the same frame), where I don't have to first create the new canvas. This functionality is provided by Paint Shop pro 5, which I have been using under wine in Mint 20. I would very much like to ditch Paint Shop Pro it in favor of a native linux app, that offers this specific functionality. I have explored the following apps somewhat superficially - to the best of my knowledge, none of them will do what I want: pinta, gwenview, nomacs, digikam, image magick, gtthumb, krita, gphoto, showfoto. I also briefly attempted to explore gimp plug-ins; again no joy. Please let me know if you know of a native linux app or gimp plugin that replicates this particular Paint Shop Pro functionality. For what it's worth, prior to posting this question, I searched this forum and others for questions directly on point with respect to this particular functionality, and didn't find anything. Given the situation, and given that Corel Draw (the makers of Paint Shop Pro) services the Apple and Windows operating systems but not linux, I am beginning to suspect that I am beating a dead horse. That is, there may be something inherent in the Linux "windowing" system that makes this functionality problematic. I also welcome any technical opinions, re the previous paragraph. Further, if you think that I am beating a dead horse, I welcome any suggested app, that you think "comes closest" to what I want.