- paper with multiple pdfs
- search  over all other fields, including: notes, pdf
- [minor] col paper state is not consistent when search on and off. So we have to decide whether MainApp or PaperCol has to keep track of current state vs search state.
- move search gui to a separate window
- Change background, text color


- format id of bib entry
- check duplicated IDs


- What if an entry has no created_time.

- Reading history
