QOL idea: ctrl-shift-clicking stackable items from one inventory to another transfers a single item

Problem:

Map fragments and scarab stacking is great when you're picking them up in heists or expeditions or whatever, but when you're *using* them, you only need one from each stack.

While we previously only needed to ctrl-click the fragments out of the stash and into our inventory, and then ctrl-click them into our map device, separating out a single fragment on its way from the stash to the map device requires substantially more actions and mouse movement than they did when fragments didn't stack (more wear and tear on the wrists).


Solution:

Implement a UI mechanic where holding both ctrl (instant transfer) *and* shift (split stack) when a stackable item is clicked while multiple inventory windows are open causes a single item to be transferred instead of an entire stack of that item.