sadpandajoe commented on code in PR #45051:
URL: https://github.com/apache/superset/pull/45051#discussion_r4217694361


##########
superset-frontend/src/dashboard/components/nativeFilters/FilterBar/FilterControls/FilterControls.overflow.test.tsx:
##########
@@ -565,3 +570,114 @@ test('focusing a filter that has not overflowed does not 
open the dropdown', asy
 
   expect(mockDropdownOpen).not.toHaveBeenCalled();
 });
+
+test('initializes horizontal bar with items when native filters are 
configured', async () => {
+  const filters = [
+    createSelectNativeFilter('NATIVE_FILTER-1', 'country'),
+    createSelectNativeFilter('NATIVE_FILTER-2', 'city'),
+  ];
+  renderHorizontal(filters, buildDataMaskSelected(filters));
+  await waitFor(() => expect(latestProps()).toBeTruthy());
+  expect(latestProps().items).toHaveLength(2);
+});
+
+test('renders native filters with requiredFirst and default values in the 
horizontal row', async () => {
+  const filters = [
+    {
+      ...createSelectNativeFilter('NATIVE_FILTER-1', 'account'),
+      requiredFirst: true,
+    },
+    createSelectNativeFilter('NATIVE_FILTER-2', 'region'),
+  ];
+  const dataMask = buildDataMaskSelected(filters, ['NATIVE_FILTER-1']);
+  renderHorizontal(filters, dataMask);
+
+  await waitFor(() => expect(latestProps()).toBeTruthy());
+  expect(latestProps().items).toHaveLength(2);
+  expect(latestProps().items.map(i => i.id)).toEqual([
+    'NATIVE_FILTER-1',
+    'NATIVE_FILTER-2',
+  ]);
+});
+
+test('maintains filter item order in horizontal bar', async () => {
+  const filters = [
+    createSelectNativeFilter('NATIVE_FILTER-1', 'alpha'),
+    createSelectNativeFilter('NATIVE_FILTER-2', 'beta'),
+    createSelectNativeFilter('NATIVE_FILTER-3', 'gamma'),
+  ];
+  renderHorizontal(filters, buildDataMaskSelected(filters));
+
+  await waitFor(() => expect(latestProps()).toBeTruthy());
+  expect(latestProps().items.map(i => i.id)).toEqual([
+    'NATIVE_FILTER-1',
+    'NATIVE_FILTER-2',
+    'NATIVE_FILTER-3',
+  ]);
+});
+
+test('provides correct filter count when filters include requiredFirst', async 
() => {
+  const filters = [
+    {
+      ...createSelectNativeFilter('NATIVE_FILTER-1', 'account'),
+      requiredFirst: true,
+    },
+    createSelectNativeFilter('NATIVE_FILTER-2', 'country'),
+    createSelectNativeFilter('NATIVE_FILTER-3', 'status'),
+  ];
+  renderHorizontal(filters, buildDataMaskSelected(filters));
+
+  await waitFor(() => expect(latestProps()).toBeTruthy());
+  expect(latestProps().items).toHaveLength(3);
+});
+
+// Regression test group for issue #45050:
+// Prevents DropdownContainer closed popover from stealing OutPortal nodes
+// into hidden DOM when requiredFirst native filters and table cross-filters 
coexist.
+test('does not pass forceRender to DropdownContainer even when a filter has 
requiredFirst (regression test for #45050)', async () => {
+  const filters = [
+    {
+      ...createSelectNativeFilter('NATIVE_FILTER-1', 'account'),
+      requiredFirst: true,
+    },
+    createSelectNativeFilter('NATIVE_FILTER-2', 'flow'),
+  ];
+
+  renderHorizontal(filters, buildDataMaskSelected(filters));
+
+  await waitFor(() => expect(latestProps()).toBeTruthy());

Review Comment:
   The new real-container test still can't fail on this bug: the cross-filter 
is already in the initial state at mount, so no chip is added after the first 
measurement, and jsdom gives zero geometry so nothing ever overflows or opens a 
popover. Restoring `forceRender={hasRequiredFirst}` would leave it green, and 
`toBeInTheDocument()` also passes for controls sitting in a hidden popover. 
Could the test render without the chip, force overflow geometry, then add the 
cross-filter while More is closed, and assert the row controls stay visible 
(checked to fail with `forceRender` restored)?



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