History
Interface

Each row corresponds to an action made in the effect editor. They are ordered from top to down.
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Previous actions
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Last made action (current state)
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Undone actions
You can change the current action with Ctrl+Z, Ctrl+Y, UpArrow, DownArrow, or by selecting an action with left mouse button.

When hovering an action row, the tooltip show the time elapsed since it was recorded.