Edit button and Ignoring aesthetic changes​

Any change (even if it visual change only like zoom or moving diagram objects), tool considers that change should be saved by user (or at least diagram is different than original), which can be unpleasant in case user does not want to save changes. 

To resolve this issue, we are planning to put a button "Edit", which needs to be clicked if user wants to save, otherwise tool will not bother user by alerting that you have unsaved changes.

Ignoring aesthetic changes function (zooming, dragging, etc)could also be useful.