When Alt switches the Pencil (with Alt key toggles to Smooth Tool on)
or the Blob Brush to the Smooth tool, the drag sent the drawing tool's
own Fidelity (1.5 by default) to path.smoothRegion. The Smooth tool
sends its own Fidelity (2.5 by default, set in Smooth Tool Options).
Both tools now smooth with the Smooth tool's Fidelity. The engine gives
them the stored Smooth Fidelity when it makes the tool, and again when
Smooth Tool Options changes while one of them is active. Each tool's
own Fidelity still sets how its strokes are fitted.
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