Update evaluated references upon saving block definition edits while preserving each reference's independent parameter values, visibility states, and undo history.
Reconcile representation members by native element identity rather than positional index, preserving handles, extension dictionaries, reactors, nested attribute handles, and 3D polyline vertex handles. Prune erased targets from action dependencies, synchronize anonymous block base points, and prevent element ID collisions across undo/redo. Coalesce representation updates into editor undo deltas and composite structure snapshots for symmetric undo/redo.
Add BACTIONSET and the Block Editor Action Selection ribbon entry. Pick or preselect an action, replace/add/remove its drawing targets, or redefine a Stretch frame while preserving the native action and graph identity.
Retain existing Stretch vertex bindings during target edits and bind new targets against the stored frame. Allow removing invalid bindings or rebuilding them through a replacement frame. Rebuild evaluated references at their independent cached values so removed targets lose old action effects, with local undo, discard and one drawing save delta.
Validate synthetic native DWG/DXF roundtrips, shared COPY representations, stale-result guards, reference geometry refresh, frame/cancel/history and the real ribbon flyout. 347 block tests pass (6 existing opt-in ignored), plus 42 dock and 27 viewport tests.
Add the current-state selector, Visibility States dialog and mode/show/hide
controls to the contextual ribbon, using shared icons, tooltips, modal UI
and adaptive flyouts. Disable the controls until a Visibility parameter exists.
Stage state creation, rename, deletion, current-state changes and reordering
until OK. Support copied, show-all and hide-all new states in one undo step,
preserve native graph metadata, and restore current-state identity on undo/redo.
Implement nonsaved BVMODE and display-only reveal during BVSHOW selection.
Cancelling selection leaves saved visibility flags and history unchanged.
Keep the existing command-line state workflows available.
Validation: 6 targeted tests; 277 block, 31 app dock, 35 ribbon and 12 history
checks passed (overlapping filters). All 17 local DWG fixtures passed in-memory
DWG/DXF preservation checks with unchanged original checksums.
Avoid rebuilding derived caches and clearing tessellation memos when closing the block editor on clean exit or discard. Scope entity delta computation to block record members instead of scanning and cloning the entire drawing, and add a fast path to the dirty check when no local commands were executed.
Reference-only entities (plugin API v9): a scene-scoped, in-memory
designation for plugin-owned display geometry, plus HostNotification
dispatch to native plugins so they can re-mark on DocumentOpened.
Resolves the new DeltaSnapshot site in block_editor.rs.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Open the Edit Block Definition dialog when BEDIT is invoked without an active selection, listing candidate block definitions alphabetically while filtering layout records, anonymous blocks, and external references. Allow typing a new valid block name to start an empty block editor session that only commits to the drawing block table upon explicit save.
Preview the current unsaved block in a disposable drawing with independent history. Keep normal Draw tools available, append Close Test Block, and return to the original editor without saving. Guard persistence paths and handle refresh and parent-close lifecycle by stable document identity.
Create a new named definition from current session edits, restore the source checkpoint, and continue editing the copy with fresh local history. Add the name dialog and Save dropdown, clone supported owned metadata onto independent handles, and refuse unsupported relationships atomically.
In the Block Editor, BVSTATE makes a new visibility state, makes one
current, renames or deletes one; BVHIDE and BVSHOW hide or show the
picked objects in the current state (BVSHOW shows every object of the
block while they are picked). The first use makes the block dynamic.
The states are stored as the format keeps them: a
BLOCKVISIBILITYPARAMETER in the block's ACAD_ENHANCEDBLOCK evaluation
graph with its visibility grip and the grip's two location expressions,
the round-trip purge preventer, AcDbDynamicBlockTrueName /
AcDbDynamicBlockGUID / AcDbBlockRepETag on the definition and element
tags on each of its objects. The definition shows its first state; a
reference given another state gets its own evaluated *U copy, tagged
AcDbBlockRepBTag and linked back through AcDbBlockRepresentation /
AcDbRepData, so it shows that state and the other references do not
change. Saving the block drops erased objects from the states.
Checked: a block authored this way reads back with its states and
reference link from DWG and DXF, and the ODA converter accepts the DWG.
Closes#1566
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Karim Jerbi