A blend made with Create Spine set to Never now shows the Appearance
widget with the Selection and Blend tools, so its color Shift can be
dragged on the canvas as on a blend with a spine. The Easing widget
stays hidden, since easing needs a spine.
The widget sits 16 px above the halfway point, by length, of the
straight lines between the key centers that the steps are laid out
along, and a drag follows those lines' direction there. The lines are
not drawn. `blend_layout_line` exposes that line; `blend_spine` still
returns `None` for such a blend.
- After a drag past either end of the range, the first arrow key now
steps back from the value shown instead of doing nothing.
- With the Selection tool, a plain double-click on a blend widget no
longer edits or isolates the artwork under it, or leaves isolation.
Ctrl/Cmd+Shift double-click still releases a guide there.
- docs/mcp.md says the lower widget shows only when the steps follow
the spine, and the G13 blend easing entry in docs/gaps.md no longer
lists on-canvas easing handles as missing.
With one whole blend selected, the Selection and Blend tools show two
widgets at the halfway point of its spine. Dragging the upper widget
along the spine sets the color shift (-100 to 100), and dragging the
lower one sets the easing strength (0 to 100). The lower widget shows
only when the steps follow a spine (a replaced spine or Align to Path),
the rule the step placement uses; a blend made without a spine shows
neither. When the boxes of three or more other visible objects hold a
widget's spot, the widget moves out in 16 px steps, up to 144 px, and
its line to the halfway point grows with it. While a widget is held,
the arrow keys step its value by 1 (Shift: by 10), and Escape or a
switch to another tool cancels the drag. A drag is one undo step; a
click or a drag that ends where it started records none.
- object.blend.setEasing sets easingType, ramp and colorShift on one
blend, refuses a hidden or locked blend and easing on a blend without
a spine, and records no undo step when nothing changes.
- BlendSpec::eases_along_spine holds the rule the step placement and
the widget share.
- While a tool is busy, an arrow it claims arrives with the press's
Shift and Alt; before, it always arrived plain.
Docs: docs/mcp.md, docs/target-app-parity.md.
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