Decrease number of "Numeric pointer" when undoing numbers 

SUMMARY
When using "numeric pointer" tool, numbering is automatically increased. However, if user undo last "numeric pointer" object insertion step, numeration not "decreased", so user must change it manually.

I think this behaviour could be enhanced as if user do a "undo" and last used action was to add a "numeric pointer", Spectacle should decrease numeration too.

;)

Thank you