Tilemaps are a new placeable asset type that is painted with autotiles in the scene view, with layers, brush, eraser and rectangle, and is drawn at runtime and in the export (#128)

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/editor/inspector/objectSection.ts

@@ -44,9 +44,10 @@ import { aspectActions, sizeCommand } from './aspectAction';
 import { defSignature } from './assetSection';
 import { actionIf, createFieldRow, type FieldRow, labelledRow, type RowActions } from './fieldFactory';
 import { addGap, addNameField, addNote, addTitle, type InspectorHost } from './host';
-import type { ListSlot } from '../state';
+import type { EditorState, ListSlot } from '../state';
 import { parentRow } from './parentRow';
 import { listOpener, previewingHandlers, structFields } from './previewHandlers';
+import { buildTilemapSection, tilemapSignature } from './tilemapSection';
 import { overrideValue } from './valueSpecs';
 import { buildVariable } from './variableRows';
 import { currentProps, currentRef, deviations, positionMoved, targetOf, viewOf } from './objectQueries';
@@ -62,13 +63,14 @@ export function objectRows(project: Project, asset: Asset, object: SceneObject):
     : schemaForObject(project, asset, object).filter((def) => !isCommonProp(def.key));
 }
 
-/** Structure-defining facts of an object selection: parent, template link and schema. */
+/** Structure-defining facts of an object selection: parent, template link, schema and painting. */
 export function objectSignature(
-  project: Project,
+  state: EditorState,
   holderId: string,
   objectIds: readonly string[],
   objectId: string,
 ): string {
+  const project = state.project;
   if (objectIds.length > 1) return `multi|${objectIds.join(',')}`;
   const holder = findObjectHolder(project, holderId);
   const view = holder && resolvedHolder(project, holder);
@@ -81,7 +83,8 @@ export function objectSignature(
       ? 'instance'
       : '';
   const rows = schemaForObject(project, asset, object);
-  return `${object.parentId}|${kind}|` + rows.map(defSignature).join(',');
+  const painting = asset.type === 'tilemap' ? `|${tilemapSignature(state, asset)}` : '';
+  return `${object.parentId}|${kind}|` + rows.map(defSignature).join(',') + painting;
 }
 
 /** Several objects: what they are, and the actions that apply to all of them at once. */
@@ -204,6 +207,7 @@ export function buildObjectSection(host: InspectorHost, holderId: string, object
   markObjectRows(host, object, asset, target);
 
   if (asset.type === 'container') contentSection(host, holderId, object, asset.objects.length);
+  if (asset.type === 'tilemap') buildTilemapSection(host, asset);
 }
 
 function assetLink(host: InspectorHost, label: string, asset: Asset): void {