LibWeb: Add fast_is<T>() for Layout::Label

Spotted this in a profile while wheel scrolling up & down.

2 files changed, 7 insertions, 1 deletions

diff --git a/Userland/Libraries/LibWeb/Layout/Label.h b/Userland/Libraries/LibWeb/Layout/Label.h
index 4c132e459c..31fcbfea83 100644
--- a/Userland/Libraries/LibWeb/Layout/Label.h
+++ b/Userland/Libraries/LibWeb/Layout/Label.h
@@ -11,7 +11,7 @@
 
 namespace Web::Layout {
 
-class Label : public BlockContainer {
+class Label final : public BlockContainer {
 public:
     Label(DOM::Document&, HTML::HTMLLabelElement*, NonnullRefPtr<CSS::StyleProperties>);
     virtual ~Label() override;
@@ -27,10 +27,15 @@ public:
     void handle_mousemove_on_label(Badge<TextNode>, const Gfx::IntPoint&, unsigned button);
 
 private:
+    virtual bool is_label() const override { return true; }
+
     static Label* label_for_control_node(LabelableNode&);
     LabelableNode* control_node();
 
     bool m_tracking_mouse { false };
 };
 
+template<>
+inline bool Node::fast_is<Label>() const { return is_label(); }
+
 }
diff --git a/Userland/Libraries/LibWeb/Layout/Node.h b/Userland/Libraries/LibWeb/Layout/Node.h
index f466652439..014db131d4 100644
--- a/Userland/Libraries/LibWeb/Layout/Node.h
+++ b/Userland/Libraries/LibWeb/Layout/Node.h
@@ -104,6 +104,7 @@ public:
     virtual bool is_initial_containing_block_box() const { return false; }
     virtual bool is_svg_box() const { return false; }
     virtual bool is_svg_path_box() const { return false; }
+    virtual bool is_label() const { return false; }
 
     template<typename T>
     bool fast_is() const = delete;