Desktop,Mobile: Fixes #11065: Improve performance when there are many selected items (#11067)

packages/lib/BaseModel.test.ts

@@ -0,0 +1,31 @@
+import BaseModel from './BaseModel';
+
+describe('BaseModel', () => {
+	test.each([
+		[0, 0],
+		[4, 10],
+		[10, 4],
+		[5, 5],
+	])('should filter items by IDs (itemCount: %d, idCount: %d)', (itemCount, idCount) => {
+		const items = [];
+		const ids = [];
+
+		const expectedMatchingItems = [];
+		for (let i = 0; i < idCount; i++) {
+			const id = `matching-${i}`;
+			ids.push(id);
+
+			if (items.length < itemCount) {
+				const item = { id };
+				items.push(item);
+				expectedMatchingItems.push(item);
+			}
+		}
+
+		while (items.length < itemCount) {
+			items.push({ id: `non-matching-${items.length}` });
+		}
+
+		expect(BaseModel.modelsByIds(items, ids)).toMatchObject(expectedMatchingItems);
+	});
+});