Include non-shadowdom children of shadow hosts in style calculation (#34298)

* Include non-shadowdom children of shadow hosts in style calculation

This was previously causing crashes because the layout nodes
of those children would never be assigned style data by stylo.

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

* Update WPT expectations

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

---------

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

tests/wpt/meta/shadow-dom/slotchange-event.html.ini

@@ -1,2 +1,96 @@
 [slotchange-event.html]
-  expected: CRASH
+  [slotchange event must fire on a default slot element inside an open shadow root  in a document]
+    expected: FAIL
+
+  [slotchange event must fire on a default slot element inside a closed shadow root  in a document]
+    expected: FAIL
+
+  [slotchange event must fire on a default slot element inside an open shadow root  not in a document]
+    expected: FAIL
+
+  [slotchange event must fire on a default slot element inside a closed shadow root  not in a document]
+    expected: FAIL
+
+  [slotchange event must fire on a named slot element insidean open shadow root  in a document]
+    expected: FAIL
+
+  [slotchange event must fire on a named slot element insidea closed shadow root  in a document]
+    expected: FAIL
+
+  [slotchange event must fire on a named slot element insidean open shadow root  not in a document]
+    expected: FAIL
+
+  [slotchange event must fire on a named slot element insidea closed shadow root  not in a document]
+    expected: FAIL
+
+  [slotchange event must not fire on a slot element inside an open shadow root  in a document when another slot's assigned nodes change]
+    expected: FAIL
+
+  [slotchange event must not fire on a slot element inside a closed shadow root  in a document when another slot's assigned nodes change]
+    expected: FAIL
+
+  [slotchange event must not fire on a slot element inside an open shadow root  not in a document when another slot's assigned nodes change]
+    expected: FAIL
+
+  [slotchange event must not fire on a slot element inside a closed shadow root  not in a document when another slot's assigned nodes change]
+    expected: FAIL
+
+  [slotchange event must fire on a slot element when a shadow host has a slottable and the slot was inserted and must not fire when the shadow host was mutated after the slot was removed inside an open shadow root  in a document]
+    expected: FAIL
+
+  [slotchange event must fire on a slot element when a shadow host has a slottable and the slot was inserted and must not fire when the shadow host was mutated after the slot was removed inside a closed shadow root  in a document]
+    expected: FAIL
+
+  [slotchange event must fire on a slot element when a shadow host has a slottable and the slot was inserted and must not fire when the shadow host was mutated after the slot was removed inside an open shadow root  not in a document]
+    expected: FAIL
+
+  [slotchange event must fire on a slot element when a shadow host has a slottable and the slot was inserted and must not fire when the shadow host was mutated after the slot was removed inside a closed shadow root  not in a document]
+    expected: FAIL
+
+  [slotchange event must fire on a slot element inside an open shadow root  in a document even if the slot was removed immediately after the assigned nodes were mutated]
+    expected: FAIL
+
+  [slotchange event must fire on a slot element inside a closed shadow root  in a document even if the slot was removed immediately after the assigned nodes were mutated]
+    expected: FAIL
+
+  [slotchange event must fire on a slot element inside an open shadow root  not in a document even if the slot was removed immediately after the assigned nodes were mutated]
+    expected: FAIL
+
+  [slotchange event must fire on a slot element inside a closed shadow root  not in a document even if the slot was removed immediately after the assigned nodes were mutated]
+    expected: FAIL
+
+  [slotchange event must fire on a slot element inside an open shadow root  in a document when innerHTML modifies the children of the shadow host]
+    expected: FAIL
+
+  [slotchange event must fire on a slot element inside a closed shadow root  in a document when innerHTML modifies the children of the shadow host]
+    expected: FAIL
+
+  [slotchange event must fire on a slot element inside an open shadow root  not in a document when innerHTML modifies the children of the shadow host]
+    expected: FAIL
+
+  [slotchange event must fire on a slot element inside a closed shadow root  not in a document when innerHTML modifies the children of the shadow host]
+    expected: FAIL
+
+  [slotchange event must fire on a slot element inside an open shadow root  in a document when nested slots's contents change]
+    expected: FAIL
+
+  [slotchange event must fire on a slot element inside a closed shadow root  in a document when nested slots's contents change]
+    expected: FAIL
+
+  [slotchange event must fire on a slot element inside an open shadow root  not in a document when nested slots's contents change]
+    expected: FAIL
+
+  [slotchange event must fire on a slot element inside a closed shadow root  not in a document when nested slots's contents change]
+    expected: FAIL
+
+  [slotchange event must fire at the end of current microtask after mutation observers are invoked inside an open shadow root  in a document when slots's contents change]
+    expected: FAIL
+
+  [slotchange event must fire at the end of current microtask after mutation observers are invoked inside a closed shadow root  in a document when slots's contents change]
+    expected: FAIL
+
+  [slotchange event must fire at the end of current microtask after mutation observers are invoked inside an open shadow root  not in a document when slots's contents change]
+    expected: FAIL
+
+  [slotchange event must fire at the end of current microtask after mutation observers are invoked inside a closed shadow root  not in a document when slots's contents change]
+    expected: FAIL