Copy/Paste undo limit

[LindaJuffermans]

Three or four days ago, I copied a mobfarm from my creative singleplayer world, into the survival world on a server where I play.
Today, I wanted to paste another template, I had it anchored and meant to rotate but I accidentally clicked undo - as they are both arrows and above eachother - and it removed my mobfarm overflowing my inventory with blocks.

I would like to see something to prevent this. For example:

• option to clear undo buffer
• clear undo buffer on template load
• ask for confirmation when trying to undo after an hour