text undo redo machanicsm like googledocs/MS word
I find most rich internet text editors, developers put in the product many many features but fail to make a decent undo redo mechanism, I pressed crtl+z they deleted my whole paragraph. Unlike googledocs's one, it knows exactly what to undo.
If anyone can let me know what the logic of google docs/Ms word machanism is, maybe I can give it shot building one.