Without looking I would be hesitent to say.
For the drop list specifically, when the game tries to show the drop interface it creates a copy of your inventory to work on in order to collapse seperate stacks of the same item into one bundle and stuff. If you you then open the inspect view, the drop interface needs to persist the changes that you may (or may not!) have made to this temporary inventory state. If, then, you can get out of the drop interface without it being able to clear the temporary state that it was using, the next time the drop interface is displayed it doesn't create a new copy of your inventory - it uses the old one it can already see exists.