Two-entity constraints move only the second pick (tangent, parallel, perpendicular, equal, concentric, coincident, collinear, symmetric, midpoint): the constraint is applied with the first entity held (solve_holding), the second keeping its size where it can (lines turn and slide, circles translate), then resizing; if the second is fixed, projected or fully constrained the first moves instead, and if neither can the constraint is refused and nothing changes; later solves hold nothing. Context-menu constraints keep the selection order; a curve picked before a point puts the point on the curve

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

crates/sketch/src/lib.rs

@@ -27,7 +27,7 @@ pub use link::{Link, LinkGeom, LinkKind, LinkSource, MAX_LINK_ENTITIES};
 pub use model::{Constraint, ConstraintKind, Curve, CurveKind, SPoint, Sketch, SketchError};
 pub use profiles::{Profile, find_drawn_profiles, find_profiles, merge_regions};
 pub use shape::{Shape, intersections};
-pub use solver::{SolveReport, SolveStatus, solve};
+pub use solver::{Hold, SolveReport, SolveStatus, solve, solve_holding};
 pub use text::{MAX_TEXT_CHARS, text_geometry};
 pub use wire::{MAX_WIRE_POINTS, Wire};