Introduce a cache for the grid overlay to prevent redundant geometry
reconstruction on every UI redraw. Extract the pure projection logic
from draw_grid into a renderer-free grid_segments function, and add
GridKey and GridCanvasState to memoize the resulting Geometry.
The cache key includes all per-pane GridParams and the overlay bounds,
preventing stale geometry when camera changes within the same canvas
size. On a params-key miss, the iced cache is cleared before redrawing
to bypass its bounds-only reuse.
Tests: 8 new unit tests cover key invalidation and state handling.
Benchmarks: uncached geometry ~32 us/frame vs cached decision ~90 ns,
a >99% reduction. Verified: 472 passed / 1 pre-existing failure / 4
ignored.
Tests:
ui::overlay::grid_key_tests::grid_key_matches_identical_params
ui::overlay::grid_key_tests::grid_key_invalidates_on_changed_fields
ui::overlay::grid_key_tests::grid_key_invalidates_when_any_pane_changes
ui::overlay::grid_key_tests::should_reuse_empty
ui::overlay::grid_key_tests::should_reuse_equal
ui::overlay::grid_key_tests::should_reuse_changed
ui::overlay::grid_canvas_state_tests::default_state_has_no_cached_key
ui::overlay::grid_canvas_state_tests::stored_key_is_recognized_by_should_reuse
Sync current main and companion codec changes before preserving unsupported frame rows, rendering in the entity plane, and sharing final layout metrics with placement preview.
INSERT enumerated all block names in a single prompt string, causing unbounded overlay growth and full-screen occlusion in drawings with many blocks. Replace prompt enumeration with a ranked, incrementally filtered suggestion model: BlockPicker maintains precomputed lower/upper caches and usage ranks (MRU/frequency), filters via O(n) substring scan and partial sorting (select_nth_unstable) to O(k), bounded to CLIPROMPTLINES.
Introduce CLIPROMPTLINES (Integer 0-50, Registry, default 3) for the number of temporary prompt lines above the command window; persist in UserSettings, expose via SETVAR and direct entry, enforce in CommandLine::view. Suggestion count is in direct relation to CLIPROMPTLINES (limit = clip, capped to 50).
Make search live without requiring Enter: add CadCommand::on_live_input, implement for INSERT/MINSERT via picker.set_needle, and wire to command-line input paths (Message::CommandInput, on_command_append_char, on_command_backspace). Updates use upper/lower caches and partial sort for <0.2ms per keystroke on 10k blocks, with debounced block-usage persistence (MRU cap 20, freq cap 200) to avoid I/O thrash. Correct tri_count test helper to use display_from_solid.
Hakan Seven