Larger thumbnails to support 4k / HiDPI displays
It would be helpful if the gThumb browser thumbnails supported some larger sizes for 4k / HiDPI displays. I'm currently using 256 as my thumbnail size, which is the largest offered, and on my 27" 4k monitor, the thumbnails are very tiny. They're barely big enough to be usable but I'm guessing on an 8k monitor 256 would be too small for the image to be recognizable. Maybe 512 and 768 and 1024 sizes could be added?