style: Introduce TNode::is_in_document.

MozReview-Commit-ID: BrhhoOghtUL
Signed-off-by: Emilio Cobos Álvarez <emilio@crisal.io>

3 files changed, 13 insertions, 1 deletions

diff --git a/components/layout_thread/dom_wrapper.rs b/components/layout_thread/dom_wrapper.rs
index 6433b9f163d..ebf7d12cbae 100644
--- a/components/layout_thread/dom_wrapper.rs
+++ b/components/layout_thread/dom_wrapper.rs
@@ -213,6 +213,10 @@ impl<'ln> TNode for ServoLayoutNode<'ln> {
         unsafe { self.node.get_flag(NodeFlags::CAN_BE_FRAGMENTED) }
     }
 
+    fn is_in_document(&self) -> bool {
+        unsafe { self.node.get_flag(NodeFlags::IS_IN_DOC) }
+    }
+
     unsafe fn set_can_be_fragmented(&self, value: bool) {
         self.node.set_flag(NodeFlags::CAN_BE_FRAGMENTED, value)
     }
@@ -417,7 +421,7 @@ impl<'le> TElement for ServoLayoutElement<'le> {
     }
 
     unsafe fn set_dirty_descendants(&self) {
-        debug_assert!(self.as_node().node.get_flag(NodeFlags::IS_IN_DOC));
+        debug_assert!(self.as_node().is_in_document());
         self.as_node().node.set_flag(NodeFlags::HAS_DIRTY_DESCENDANTS, true)
     }
 
diff --git a/components/style/dom.rs b/components/style/dom.rs
index 9c49b37f704..24a58a369cc 100644
--- a/components/style/dom.rs
+++ b/components/style/dom.rs
@@ -191,6 +191,9 @@ pub trait TNode : Sized + Copy + Clone + Debug + NodeInfo + PartialEq {
         DomChildren(self.first_child())
     }
 
+    /// Returns whether the node is attached to a document.
+    fn is_in_document(&self) -> bool;
+
     /// Iterate over the DOM children of a node, in preorder.
     fn dom_descendants(&self) -> DomDescendants<Self> {
         DomDescendants {
diff --git a/components/style/gecko/wrapper.rs b/components/style/gecko/wrapper.rs
index a8851fb6e1f..dbecac5133f 100644
--- a/components/style/gecko/wrapper.rs
+++ b/components/style/gecko/wrapper.rs
@@ -292,6 +292,11 @@ impl<'ln> TNode for GeckoNode<'ln> {
         GeckoDocument(unsafe { &*self.node_info().mDocument })
     }
 
+    #[inline]
+    fn is_in_document(&self) -> bool {
+        self.get_bool_flag(nsINode_BooleanFlag::IsInDocument)
+    }
+
     fn traversal_parent(&self) -> Option<GeckoElement<'ln>> {
         self.flattened_tree_parent().and_then(|n| n.as_element())
     }