While the Smooth tool is in use with a path it can smooth selected, the
bar shows the tool's Fidelity field and Tool Options..., which opens the
Smooth tool's options. The field sets Fidelity through tool.setOption
with the same range, unit and steps as the field in the options dialog.
With nothing smoothable selected, the tool shows no bar. The bar leaves
out the selection tools' actions and the Fill, Stroke, Recolor Artwork
and Lock controls. On a canvas too narrow for the field, More Options
lists Fidelity, which opens the tool's options.
The Smooth tool's cursor and the bar share one check of the selection,
which the bar keeps for the document's revision.
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