When you're naming an item Dinnerbone in Minecraft Windows 10 edition using mouse and keyboard the anvil GUI screen closes.
Steps to reproduce
Place an item such as name tag or spawn egg in anvil.
Name the item Dinnerbone.
When naming the item "Dinnerbone" by the time you type the letter E the anvil GUI screen closes.
This is a duplicate of MCPE-16614 because when you type the letter E, it closes the inventory because the N has already shifted the focus away from the text input.