This view shows what operations are being added to the operations history for
undo. The view can be filtered by any operation context. A null operation
context indicates that the view should not be filtered.
Selecting undo or redo from the context menu or the edit menu will perform a
linear undo in the current context of the view. Selecting "Undo selected"
allows experimentation with direct undo. Operations that are undoable may be
undone independently of their order in the history.
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