layout: Ensure IFC for abspos with inline-level original display (#39041)

Absolutely positioned elements get blockified, but their static position
still depends on the original display. Therefore, if we encounter an
abspos with an inline-level original display, we will now ensure that
it's handled in an inline formatting context. This way its static
position will correctly take into account things like `text-align`.

Testing: Several WPT tests are now passing.
Fixes: #39017

Signed-off-by: Oriol Brufau <obrufau@igalia.com>

components/script/layout_dom/element.rs

@@ -615,6 +615,12 @@ impl<'dom> style::dom::TElement for ServoLayoutElement<'dom> {
                 return true;
             }
 
+            if new_box.position.is_absolutely_positioned() &&
+                old_box.original_display != new_box.original_display
+            {
+                return true;
+            }
+
             if old.get_font() != new.get_font() {
                 return true;
             }