~~NOTOC~~
====== Undo and Redo  ======

{{page>01_user_documentation:06_graph:05_derivation:02_transaction:01_log&noheader}}

======  ======

The commands are:

  * {{page>01_user_documentation:06_graph:05_derivation:02_transaction:01_log:01_undo}}
  * {{page>01_user_documentation:06_graph:05_derivation:02_transaction:01_log:02_redo}}

**Note: applying a transaction take some time. Clicking very fast between undo/redo, might trigger a transaction before the last one is properly performed. It usually lead to a NullPointerException.**