UndoTrackedVariables

is an option for Manipulate, DynamicModule, and related functions that sets variables that should be tracked by the front end's undo mechanism.

Details

The typical usage is UndoTrackedVariables:>{var₁,var₂,…}.
By default, changes to DynamicModule variables are not tracked by the undo mechanism.
If an evaluation that changes an affected DynamicModule variable also produces other undoable side effects on the notebook, then a single use of the Undo menu command will revert the variable change and all other undoable changes.

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Create an interface that responds to the Undo menu command:

Controls such as locators track only the beginning and ending variable values, not the intermediate ones:

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