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Everything is described in this post
When the disk is full, each open note becomes a blank note (it is erased)
- Prevent the open notes to be modified (the note should be in read-only)
- Receive a strong visible warning message to say : “You cannot modify the note until there are more available disk space”
- manually detect that notes are erased
- manually free disk space
- go to the deleted blank notes and press ctrl Z to restore the content