This could use some more thought, in particular with regards to session management. My own config has session management enabled so that the closed buffer list is session-local, but I can't make the same assumptions here that I use for my own config so I'll just go with a simpler implementation for now.
Closes #202
Implement basic buffer restore functionality.
This could use some more thought, in particular with regards to session management. My own config has session management enabled so that the closed buffer list is session-local, but I can't make the same assumptions here that I use for my own config so I'll just go with a simpler implementation for now.