LibWeb: Visit ImageProvider from Layout::ImageBox

Adds missing visit of HTMLElement that serves as image provider of
image layout node.

Userland/Libraries/LibWeb/HTML/HTMLImageElement.h

@@ -91,6 +91,7 @@ public:
     virtual Optional<CSSPixelFraction> intrinsic_aspect_ratio() const override;
     virtual RefPtr<Gfx::ImmutableBitmap> current_image_bitmap(Gfx::IntSize = {}) const override;
     virtual void set_visible_in_viewport(bool) override;
+    virtual JS::NonnullGCPtr<DOM::Element const> to_html_element() const override { return *this; }
 
     virtual void visit_edges(Cell::Visitor&) override;
 

Userland/Libraries/LibWeb/HTML/HTMLInputElement.h

@@ -205,6 +205,7 @@ private:
     virtual Optional<CSSPixelFraction> intrinsic_aspect_ratio() const override;
     virtual RefPtr<Gfx::ImmutableBitmap> current_image_bitmap(Gfx::IntSize = {}) const override;
     virtual void set_visible_in_viewport(bool) override;
+    virtual JS::NonnullGCPtr<DOM::Element const> to_html_element() const override { return *this; }
 
     virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;

Userland/Libraries/LibWeb/HTML/HTMLObjectElement.h

@@ -81,6 +81,7 @@ private:
     virtual Optional<CSSPixelFraction> intrinsic_aspect_ratio() const override;
     virtual RefPtr<Gfx::ImmutableBitmap> current_image_bitmap(Gfx::IntSize = {}) const override;
     virtual void set_visible_in_viewport(bool) override;
+    virtual JS::NonnullGCPtr<DOM::Element const> to_html_element() const override { return *this; }
 
     Representation m_representation { Representation::Unknown };
 

Userland/Libraries/LibWeb/Layout/ImageBox.cpp

@@ -22,6 +22,12 @@ ImageBox::ImageBox(DOM::Document& document, DOM::Element& element, NonnullRefPtr
 
 ImageBox::~ImageBox() = default;
 
+void ImageBox::visit_edges(JS::Cell::Visitor& visitor)
+{
+    Base::visit_edges(visitor);
+    visitor.visit(m_image_provider.to_html_element());
+}
+
 void ImageBox::prepare_for_replaced_layout()
 {
     set_natural_width(m_image_provider.intrinsic_width());

Userland/Libraries/LibWeb/Layout/ImageBox.h

@@ -32,6 +32,8 @@ public:
     void dom_node_did_update_alt_text(Badge<ImageProvider>);
 
 private:
+    virtual void visit_edges(Visitor&) override;
+
     ImageProvider const& m_image_provider;
 
     Optional<CSSPixels> m_cached_alt_text_width;

Userland/Libraries/LibWeb/Layout/ImageProvider.h

@@ -25,6 +25,8 @@ public:
     virtual RefPtr<Gfx::ImmutableBitmap> current_image_bitmap(Gfx::IntSize) const = 0;
     virtual void set_visible_in_viewport(bool) = 0;
 
+    virtual JS::NonnullGCPtr<DOM::Element const> to_html_element() const = 0;
+
 protected:
     static void did_update_alt_text(ImageBox&);
 };