Completion of dynamic input features (grip dimensional input, lock icons, DYNPROMPT menu) and object snap functionality.
Raw Developer Origin & Technical Request
GitHub Issue
Oct 11, 2026
## Summary
These are the leftovers in dynamic input and object snaps (`docs/gaps.md` U2, U8).
- **Dynamic input** lacks grip dimensional input, lock icons on typed values, and the DYNPROMPT options menu (the down-arrow keyword list at the cursor).
- **Object snaps:** #332 and #334 fixed several missing snaps, so the U8 row is partly out of date. Still missing, to be re-checked:
- NOD on dimension definition points, if not done;
- INS on ATTDEF and MLEADER;
- GCEN on closed splines and polylines;
- MID on circles/ellipses (AutoCAD has none — check and correct the row).
## Scope
- **Grip dimensional input:** while stretching a grip, show the length/angle fields (DYNDIMODE / DIMDIMODE …) and accept Tab and typed values.
- **Lock icons:** a typed value in a pointer box stays locked while the cursor moves; lock icons are drawn.
- **DYNPROMPT options menu:** pressing the down arrow at a prompt with keywords shows them at the cursor, and picking one sends it.
- **DYNINFOTIPS / DYNPICOORDS** where cheap.
- **U8:** verify each listed snap on upstream/main, implement what's still missing, and correct the row.
- Engine-level, testable headless where possible; thin UI.
## Expected
Dynamic input and object snaps match publicly documented AutoCAD.
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