layout: Factor out the code to ensure a node data is initialized.

components/layout/query.rs

@@ -615,6 +615,20 @@ pub fn process_node_scroll_area_request< N: LayoutNode>(requested_node: N, layou
     }
 }
 
+/// Ensures that a node's data, and all its parents' is initialized. This is
+/// needed to resolve style lazily.
+fn ensure_node_data_initialized<N: LayoutNode>(node: &N) {
+    let mut cur = Some(node.clone());
+    while let Some(current) = cur {
+        if current.borrow_data().is_some() {
+            break;
+        }
+
+        current.initialize_data();
+        cur = current.parent_node();
+    }
+}
+
 /// Return the resolved value of property for a given (pseudo)element.
 /// https://drafts.csswg.org/cssom/#resolved-value
 pub fn process_resolved_style_request<'a, N, C>(requested_node: N,
@@ -630,17 +644,8 @@ pub fn process_resolved_style_request<'a, N, C>(requested_node: N,
     // This node might have display: none, or it's style might be not up to
     // date, so we might need to do style recalc.
     //
-    // XXX: Is a bit shame we have to do this instead of in style :/
+    // FIXME(emilio): Is a bit shame we have to do this instead of in style.
-    let mut cur = Some(requested_node);
+    ensure_node_data_initialized(&requested_node);
-    while let Some(current) = cur {
-        if current.borrow_data().is_some() {
-            break;
-        }
-
-        current.initialize_data();
-        cur = current.parent_node();
-    }
-
     ensure_node_styled(requested_node, style_context);
 
     let layout_node = requested_node.to_threadsafe();