With a blend selected, the Contextual Task Bar's Corner and Smooth
buttons failed with "select paths or anchor points", since
`path.convertAnchors` only read paths. They now convert every point of
the blend's spine, as they convert every anchor of a path selected
whole, in one undo step. The key objects stay where they are.
With Direct Selection, the Control bar and the Properties panel now
show their Convert buttons for a selected blend too.
dotCooCoo
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