#24 Undo deletes too many characters

[jerem]

Linux archlinux 4.2.3-1-ARCH
i3 version 4.11
Beaver 0.4.1

1. Create a new document
2. Write "123456"
3. Close and save
4. Open it
5. Write "ab" at the begining
6. Undo
   Expected : b123456
   What it does : 3456

Conclusion ? It looks like, using undo, while reediting, deletes the n characters you have just written and the n subsequent characters.