IDA Help: Clear undo history

 Action    name: ResetUndo
 

This command clears the undo history. After it the Undo and Redo commands become unavailable. However, once the user performs a new action, IDA will again start journaling all database modifications.

A side effect of this command is fast autoanalysis: since there is no user action to revert yet, IDA does not maintain undo buffers and this speeds up the analysis.

See also Undo Redo Disable Undo Open undo history

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