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The Data Set row at the top of the Variables panel now holds a text box with the current data set's name. A new name entered there renames the data set through dataset.rename, as one undo step. The same name runs nothing, so no undo step is added. An empty name or the name of another data set is refused, and the status bar shows the error. A list button beside the box still chooses a data set, and the arrows still step through them. With no data set the box is disabled.