feat(quick-filters): improve filter visibility and auto-open behavior

frontend/src/components/QuickFilters/FilterRenderers/Checkbox/Checkbox.styles.scss

@@ -45,6 +45,12 @@
 		flex-direction: column;
 		gap: 8px;
 
+		.filter-separator {
+			height: 1px;
+			background-color: var(--bg-slate-400);
+			margin: 4px 0;
+		}
+
 		.value {
 			display: flex;
 			align-items: center;
@@ -177,6 +183,12 @@
 				}
 			}
 		}
+
+		.values {
+			.filter-separator {
+				background-color: var(--bg-vanilla-300);
+			}
+		}
 	}
 }
 

frontend/src/components/QuickFilters/FilterRenderers/Checkbox/Checkbox.test.tsx

@@ -0,0 +1,191 @@
+import { FiltersType, QuickFiltersSource } from 'components/QuickFilters/types';
+import { useGetAggregateValues } from 'hooks/queryBuilder/useGetAggregateValues';
+import { useQueryBuilder } from 'hooks/queryBuilder/useQueryBuilder';
+import { useGetQueryKeyValueSuggestions } from 'hooks/querySuggestions/useGetQueryKeyValueSuggestions';
+import { quickFiltersAttributeValuesResponse } from 'mocks-server/__mockdata__/customQuickFilters';
+import { rest, server } from 'mocks-server/server';
+import { UseQueryResult } from 'react-query';
+import { render, screen, userEvent, waitFor } from 'tests/test-utils';
+import { SuccessResponse } from 'types/api';
+import { IAttributeValuesResponse } from 'types/api/queryBuilder/getAttributesValues';
+import { DataTypes } from 'types/api/queryBuilder/queryAutocompleteResponse';
+import { DataSource } from 'types/common/queryBuilder';
+
+import CheckboxFilter from './Checkbox';
+
+// Mock the query builder hook
+jest.mock('hooks/queryBuilder/useQueryBuilder');
+const mockUseQueryBuilder = jest.mocked(useQueryBuilder);
+
+// Mock the aggregate values hook
+jest.mock('hooks/queryBuilder/useGetAggregateValues');
+
+const mockUseGetAggregateValues = jest.mocked(useGetAggregateValues);
+
+// Mock the key value suggestions hook
+jest.mock('hooks/querySuggestions/useGetQueryKeyValueSuggestions');
+
+const mockUseGetQueryKeyValueSuggestions = jest.mocked(
+	useGetQueryKeyValueSuggestions,
+);
+
+interface MockFilterConfig {
+	title: string;
+	attributeKey: {
+		key: string;
+		dataType: DataTypes;
+		type: string;
+	};
+	dataSource: DataSource;
+	defaultOpen: boolean;
+	type: FiltersType;
+}
+
+const createMockFilter = (
+	overrides: Partial<MockFilterConfig> = {},
+): MockFilterConfig => ({
+	// eslint-disable-next-line sonarjs/no-duplicate-string
+	title: 'Service Name',
+	attributeKey: {
+		key: 'service.name',
+		dataType: DataTypes.String,
+		type: 'resource',
+	},
+	dataSource: DataSource.LOGS,
+	defaultOpen: false,
+	type: FiltersType.CHECKBOX,
+	...overrides,
+});
+
+const createMockQueryBuilderData = (hasActiveFilters = false): any => ({
+	lastUsedQuery: 0,
+	currentQuery: {
+		builder: {
+			queryData: [
+				{
+					filters: {
+						items: hasActiveFilters
+							? [
+									{
+										key: {
+											key: 'service.name',
+											dataType: DataTypes.String,
+											type: 'resource',
+										},
+										op: 'in',
+										value: ['otel-demo', 'sample-flask'],
+									},
+							  ]
+							: [],
+					},
+				},
+			],
+		},
+	},
+	redirectWithQueryBuilderData: jest.fn(),
+});
+
+describe('CheckboxFilter - User Flows', () => {
+	beforeEach(() => {
+		// Reset all mocks
+		jest.clearAllMocks();
+
+		// Default mock implementations using the same structure as existing tests
+		mockUseGetAggregateValues.mockReturnValue({
+			data: {
+				payload: {
+					stringAttributeValues: [
+						'mq-kafka',
+						'otel-demo',
+						'otlp-python',
+						'sample-flask',
+					],
+				},
+			},
+			isLoading: false,
+		} as UseQueryResult<SuccessResponse<IAttributeValuesResponse>>);
+
+		mockUseGetQueryKeyValueSuggestions.mockReturnValue({
+			data: null,
+			isLoading: false,
+		} as any);
+
+		// Setup MSW server for API calls
+		server.use(
+			rest.get('*/api/v3/autocomplete/attribute_values', (_req, res, ctx) =>
+				res(ctx.status(200), ctx.json(quickFiltersAttributeValuesResponse)),
+			),
+		);
+	});
+
+	it('should auto-open filter and prioritize checked items with visual separator when user opens page with active filters', async () => {
+		// Mock query builder with active filters
+		mockUseQueryBuilder.mockReturnValue(createMockQueryBuilderData(true) as any);
+
+		const mockFilter = createMockFilter({ defaultOpen: false });
+
+		render(
+			<CheckboxFilter
+				filter={mockFilter}
+				source={QuickFiltersSource.LOGS_EXPLORER}
+			/>,
+		);
+
+		// User should see the filter is automatically opened (not collapsed)
+		expect(screen.getByText('Service Name')).toBeInTheDocument();
+		await waitFor(() => {
+			// eslint-disable-next-line sonarjs/no-duplicate-string
+			expect(screen.getByPlaceholderText('Filter values')).toBeInTheDocument();
+		});
+
+		// User should see visual separator between checked and unchecked items
+		expect(screen.getByTestId('filter-separator')).toBeInTheDocument();
+
+		// User should see checked items at the top
+		await waitFor(() => {
+			const checkboxes = screen.getAllByRole('checkbox');
+			expect(checkboxes).toHaveLength(4); // Ensure we have exactly 4 checkboxes
+			expect(checkboxes[0]).toBeChecked(); // otel-demo should be first and checked
+			expect(checkboxes[1]).toBeChecked(); // sample-flask should be second and checked
+			expect(checkboxes[2]).not.toBeChecked(); // mq-kafka should be unchecked
+			expect(checkboxes[3]).not.toBeChecked(); // otlp-python should be unchecked
+		});
+	});
+
+	it('should respect user preference when user manually toggles filter over auto-open behavior', async () => {
+		const user = userEvent.setup({ pointerEventsCheck: 0 });
+
+		// Mock query builder with active filters
+		mockUseQueryBuilder.mockReturnValue(createMockQueryBuilderData(true) as any);
+
+		const mockFilter = createMockFilter({ defaultOpen: false });
+
+		render(
+			<CheckboxFilter
+				filter={mockFilter}
+				source={QuickFiltersSource.LOGS_EXPLORER}
+			/>,
+		);
+
+		// Initially auto-opened due to active filters
+		await waitFor(() => {
+			expect(screen.getByPlaceholderText('Filter values')).toBeInTheDocument();
+		});
+
+		// User manually closes the filter
+		await user.click(screen.getByText('Service Name'));
+
+		// User should see filter is now closed (respecting user preference)
+		expect(
+			screen.queryByPlaceholderText('Filter values'),
+		).not.toBeInTheDocument();
+
+		// User manually opens the filter again
+		await user.click(screen.getByText('Service Name'));
+
+		// User should see filter is now open (respecting user preference)
+		await waitFor(() => {
+			expect(screen.getByPlaceholderText('Filter values')).toBeInTheDocument();
+		});
+	});
+});