Steps to reproduce:
- Edit a rebaser document containing 'AB'
- Select and italicize 'AB'
- Simultaneously, cursor between A and B and press Enter twice
Expected behaviour: 'AB' is italicized
Observed behaviour: Exception due to painting outdated author selection
Bisecting shows this bug has been present since 78c7beecbf806133484ba4a9e31f1cf70da34fd1 .