object.blend.spine.moveAnchor now refuses any supplied `with` (even an
empty list) together with `handle`. Direct Selection builds the blend
spine once when drawing the picked points and once per drag preview,
instead of once per picked point. Part of #5285.
Direct Selection kept only one picked point of a blend's spine. Shift-click
now adds a point of the same spine or takes it away, and dragging any picked
point moves them all. object.blend.spine.moveAnchor takes `with`, the other
points to move by as much, with the key objects on them, in one undo step.
Convert to Smooth or Corner on a blend whose spine came from Replace
Spine stored key anchors with the converted spine, so the spine's
points then moved onto the key centers. It now changes only the
spine's handles: the points stay where they are and the keys stay
spread along the spine. Direct Selection's spine conversion and the
other spine edits are unchanged.
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.
Don Omondi