The active tilemap layer can be renamed from the painting section, and a Show setting fades or hides the other layers in the scene view while the tilemap is selected (#138)

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

tests/core/tilemap.test.ts

@@ -34,6 +34,7 @@ import {
   tilemapSize,
 } from '../../src/core/model/tilemap';
 import { tilemapsUsing } from '../../src/core/model/usages';
+import { DIMMED_LAYER_ALPHA, layerAlpha } from '../../src/viewport/tilemap';
 import { groupByTile, tileMesh } from '../../src/viewport/tilemapMesh';
 import { makeProject, roundTrip } from '../helpers';
 
@@ -318,6 +319,18 @@ describe('the layers of a tilemap', () => {
     expect(f.assetOf().layers.map((l) => l.name)).toEqual(['Layer 1', 'Roofs']);
   });
 
+  it('renames a layer without the spaces around it, refuses a blank name and undoes to the old one', () => {
+    const f = makeTilemap();
+    f.stack.execute(new RenameTilemapLayerCommand(f.tilemapId, f.layerId(), '  Ground  '));
+    expect(f.assetOf().layers[0]!.name).toBe('Ground');
+    expect(() => f.stack.execute(new RenameTilemapLayerCommand(f.tilemapId, f.layerId(), '   '))).toThrow(
+      'A layer needs a name',
+    );
+    expect(f.assetOf().layers[0]!.name).toBe('Ground');
+    f.stack.undo();
+    expect(f.assetOf().layers[0]!.name).toBe('Layer 1');
+  });
+
   it('keeps the last layer, because there has to be one to paint on', () => {
     const f = makeTilemap();
     expect(() => f.stack.execute(new RemoveTilemapLayerCommand(f.tilemapId, f.layerId()))).toThrow(
@@ -338,6 +351,17 @@ describe('the layers of a tilemap', () => {
   });
 });
 
+describe('how the scene view shows the layers next to the painted one', () => {
+  it('draws all of them whole, fades the others or leaves them out', () => {
+    expect(layerAlpha('a', null)).toBe(1);
+    expect(layerAlpha('b', { layerId: 'a', mode: 'all' })).toBe(1);
+    expect(layerAlpha('a', { layerId: 'a', mode: 'dim' })).toBe(1);
+    expect(layerAlpha('b', { layerId: 'a', mode: 'dim' })).toBe(DIMMED_LAYER_ALPHA);
+    expect(layerAlpha('a', { layerId: 'a', mode: 'solo' })).toBe(1);
+    expect(layerAlpha('b', { layerId: 'a', mode: 'solo' })).toBe(0);
+  });
+});
+
 describe('a tilemap in the document', () => {
   it('survives a round trip with its layers and cells', () => {
     const f = makeTilemap();