A constraint is applied with its first-picked entities held and the second
moving; when the second can't move, a first one moves instead. That fallback
was skipped as soon as ANY first entity was locked, so a free construction
line between two fixed lines was never tried, and Symmetry was refused with
"neither entity can move".
Each first entity that can move is now tried on its own, after the second.
Nothing changes where the second can move.
- motion.plot: joint values and a point's path sampled as the study plays (closed loops
following), with velocities and accelerations by finite differences, per step or per
second with a duration.
- motion.interference: the pairs of parts that pass through each other along a study, with
the first step, the step ranges, the depth and the shared volume; occurrences, against
or contact sets choose the pairs; bounded samples and work.
- Motion Study dialog: a Study box opens a saved study; a chart of a joint value or a
picked point with a cursor at the step shown (click to move there); Check collisions
with the steps shaded on the chart. ui.start motion.study takes study.
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