[Rseding91] [0.16.7, OSX] Crash when nesting blueprints

[2799]

OSX 10.12.6, Early 2011 MacBook Pro

Steps to repro:

- Start a new game
- Create 2 blueprint books & 3 blueprints
- Place miner & furnace
- Blueprint mine & furnace 3 times (once into each blueprint).
- Place 2 blueprints in first book & 1 blueprint in second book.
- Open first book
- Select 2nd book & click on 2nd blueprint in open book

Expected:

- No crash
- 2nd blueprint book ends up in first book, or no action

Attached save, log, & screenshot

(edit: added wrong log originally)

[Rseding91]

Thanks for the report. This was a bug due to the item stack optimization done in 0.16 - it's now fixed for the next version of 0.16.