layout: Implement node geometry queries against `BoxTree`'s `Fragment`

This is a followup to #36629, continuing to implement script-based
layout queries  using the `Fragment`s attached to the `BoxTree`. In this
change, geometry queris (apart from parent offset) are calculated using
`Fragment`s hanging of the `BoxTree`.

In order to make this work, all `Fragment`s for inlines split by blocks,
need to be accessible in the `BoxTree`. This required some changes to
the way that box tree items were stored in DOM `BoxSlot`s. Now every
inline level item can have more than a single `BoxTree` item. These are
carefully collected by the `InlineFormattingContextBuilder` -- currently
a bit fragile, but with more documentation.

Co-authored-by: Oriol Brufau <obrufau@igalia.com>
Signed-off-by: Martin Robinson <mrobinson@igalia.com>

1 files changed, 9 insertions, 3 deletions

diff --git a/components/script/dom/window.rs b/components/script/dom/window.rs
index 77d001d8151..c076407e9f7 100644
--- a/components/script/dom/window.rs
+++ b/components/script/dom/window.rs
@@ -2254,7 +2254,9 @@ impl Window {
 
     // Query content box without considering any reflow
     pub(crate) fn content_box_query_unchecked(&self, node: &Node) -> Option<UntypedRect<Au>> {
-        self.layout.borrow().query_content_box(node.to_opaque())
+        self.layout
+            .borrow()
+            .query_content_box(node.to_trusted_node_address())
     }
 
     pub(crate) fn content_box_query(&self, node: &Node, can_gc: CanGc) -> Option<UntypedRect<Au>> {
@@ -2268,14 +2270,18 @@ impl Window {
         if !self.layout_reflow(QueryMsg::ContentBoxes, can_gc) {
             return vec![];
         }
-        self.layout.borrow().query_content_boxes(node.to_opaque())
+        self.layout
+            .borrow()
+            .query_content_boxes(node.to_trusted_node_address())
     }
 
     pub(crate) fn client_rect_query(&self, node: &Node, can_gc: CanGc) -> UntypedRect<i32> {
         if !self.layout_reflow(QueryMsg::ClientRectQuery, can_gc) {
             return Rect::zero();
         }
-        self.layout.borrow().query_client_rect(node.to_opaque())
+        self.layout
+            .borrow()
+            .query_client_rect(node.to_trusted_node_address())
     }
 
     /// Find the scroll area of the given node, if it is not None. If the node