5.1. Ctrl+A, Ctrl+C, Ctrl+V, crash. 5.2. Ctrl+A, Del (or backspace), crash.
No problem with Ctrl+D (duplicate).
5.1. Ctrl+A, Ctrl+C, Ctrl+V, crash.
5.2. Ctrl+A, Del (or backspace), crash.
No problem with Ctrl+D (duplicate).