Disallow losing selected design

The issue
When you are holding a design, there are multiple ways to accidentally lose it.

To Reproduce

In the first case, I cut the design, "accidentally" clicked RMB and lost the prepared design I was working on.
In the second case, I cut the design and tried to pixel hunt assign it to the existing design "accidentally" clicking the menu element and losing the design.

Expected behaviour
The game should prevent the user from losing his design.
Disable RMB/delete key while cutting OR return it to the initial place.
Disable UI interactions when copy/cut is active OR return it to the initial place when any UI element is clicked.
The only way to remove the design should be when the delete tool is selected.

Additional context
0.4.7d

+1 for this issue. I hate to compare to another game, but what is missing in this case is an 'undo' feature like in Factorio. While holding a blueprint, if you lose it, you simply press ctrl-z to undo the loss and the blueprint is either A) back in your hand or B) back on the ground before you cut it.

Good point, undo could also revert misplaced blueprint.