Adding SHIFT + LMB to the granary just like usual containers :v Adding seeds that already are in granary just stacks them, but new get their own section.
EDIT: Don't want to invest too much into this particular UI, as it might complicate future systemic changes to seeds, flours, &c. Won't fix.
"The psychological trials of dwellers in the last times will be equal to the physical trials of the martyrs. In order to face these trials we must be living in a different world."