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The Blend tool kept its first pick, its clicked anchor and the blend it was adding to through edits made outside the tool. Picking A, recoloring other art and clicking B made a blend of A and B; undoing A's creation left the next click doing nothing. History::step names the current step by the serial numbers of the newest undo step and the next redo step. The session keeps the active document's uid and step from the tool's last pointer event and calls the new Tool::history_moved at the next pointer event, or before drawing overlays, when they differ. The tool's own edits are recorded after its actions; a selection tool lent by Cmd is not told. BlendTool clears its pick and chain there, as Escape does. A selection change keeps them.