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undo

zenith_session::session

Function undo 

Source 
pub fn undo(
    fs: &impl Fs,
    paths: &StorePaths,
    doc_id: &str,
) -> Result<Option<Vec<u8>>, SessionError>
Expand description

Undo: move HEAD to its parent snapshot. Returns the content now at HEAD, or None if the session is empty or already at the root (nothing to undo). The record we left is pushed onto the redo stack so redo can return to it.