Implement the AutoCAD compatible HATCHTOBACK (HB) command and enhance the interactive DRAWORDER command pipeline with comprehensive verb selection and viewport entity picking.
Key implementations and architectural details:
1. HATCHTOBACK command execution
* Isolates entities belonging to the active layout block record or global space.
* Filters out entities residing on locked layers using an efficient hash set lookup.
* Records targeted delta undo operations on SortEntitiesTable objects (~100 bytes) rather than snapshotting full document structures.
* Performs granular draw depth cache invalidation via Scene::invalidate_draw_depth, preserving existing geometry tessellations and spatial indices.
* Emits localized user notifications when no qualifying hatch entities are found.
2. Interactive DrawOrderCommand state machine
* Supports preselected entities as well as interactive on demand selection gathering.
* Implements subverb selection supporting single character shortcuts (A for Above, U for Under, F for Front, B for Back) and case insensitive keyword parsing.
* Enables interactive reference object picking directly in the viewport via needs_entity_pick and on_entity_pick callbacks.
* Supports hexadecimal handle specification directly from the command line interface.
3. Ecosystem and system integration
* Bumps DEFAULT_ALIASES_VERSION from 2 to 3 to register the HB alias while preserving existing user overrides.
* Integrates HATCHTOBACK and HB into dynamic autocomplete registries.
* Adds localized message strings across all 20 Fluent translation catalogs.
* Corrects hatch boundary serialization flags to ensure outermost boundary rings consistently carry the external attribute.
The ribbon kept its own \show_block_palette\ copy that the app had to
manually sync at every mutation point (the BLOCKPALETTE command and the
dock Close handler). Drop the copy and thread the app's authoritative
\show_block_palette\ into \Ribbon::view\ at render time, so the button
highlight can't drift from the panel's true visibility — those two
handlers are now mutate-points only and the ribbon view is the single
place that reads the state back.
The Insert tab's Block Palette button now behaves like the View tab toggles
(UCS Icon, View Cube, Ortho, Properties, File Tabs, Layout Tabs): it stays
highlighted while the block palette panel is open and clears when closed.
The Ribbon gains a show_block_palette flag with a set_block_palette setter,
fed into ToggleState and mapped in is_active_tool for the BLOCKPALETTE tool
id. show_block_palette on the app remains the single source of truth; both
mutation paths now mirror it onto the ribbon:
- BLOCKPALETTE / BLOCKSPALETTE command toggles ribbon state alongside the
panel (src/app/commands/blocks.rs).
- Closing the panel via the dock rail close button clears the ribbon state,
matching how Close(Properties) already syncs (src/app/update/dialog.rs).
Hakan Seven