LibWeb: Move should_treat_{width,height}_as_auto() to FormattingContext

These are not specific to BFC, so let's move them up to the super class
so that other layout classes can use them.

Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp

@@ -775,18 +775,6 @@ float BlockFormattingContext::greatest_child_width(Box const& box)
     return max_width;
 }
 
-bool BlockFormattingContext::should_treat_width_as_auto(Box const& box, AvailableSpace const& available_space)
-{
-    return box.computed_values().width().is_auto()
-        || (box.computed_values().width().contains_percentage() && !available_space.width.is_definite());
-}
-
-bool BlockFormattingContext::should_treat_height_as_auto(Box const& box, AvailableSpace const& available_space)
-{
-    return box.computed_values().height().is_auto()
-        || (box.computed_values().height().contains_percentage() && !available_space.height.is_definite());
-}
-
 void BlockFormattingContext::determine_width_of_child(Box const& box, AvailableSpace const& available_space)
 {
     compute_width(box, available_space);

Userland/Libraries/LibWeb/Layout/BlockFormattingContext.h

@@ -48,9 +48,6 @@ public:
 
     void layout_block_level_box(Box const&, BlockContainer const&, LayoutMode, float& bottom_of_lowest_margin_box, AvailableSpace const&);
 
-    static bool should_treat_width_as_auto(Box const&, AvailableSpace const&);
-    static bool should_treat_height_as_auto(Box const&, AvailableSpace const&);
-
     virtual bool can_determine_size_of_child() const override { return true; }
     virtual void determine_width_of_child(Box const&, AvailableSpace const&) override;
     virtual void determine_height_of_child(Box const&, AvailableSpace const&) override;

Userland/Libraries/LibWeb/Layout/FormattingContext.cpp

@@ -1399,4 +1399,16 @@ float FormattingContext::calculate_stretch_fit_height(Box const& box, AvailableS
         - box_state.border_bottom;
 }
 
+bool FormattingContext::should_treat_width_as_auto(Box const& box, AvailableSpace const& available_space)
+{
+    return box.computed_values().width().is_auto()
+        || (box.computed_values().width().contains_percentage() && !available_space.width.is_definite());
+}
+
+bool FormattingContext::should_treat_height_as_auto(Box const& box, AvailableSpace const& available_space)
+{
+    return box.computed_values().height().is_auto()
+        || (box.computed_values().height().contains_percentage() && !available_space.height.is_definite());
+}
+
 }

Userland/Libraries/LibWeb/Layout/FormattingContext.h

@@ -82,6 +82,9 @@ public:
 protected:
     FormattingContext(Type, LayoutState&, Box const&, FormattingContext* parent = nullptr);
 
+    static bool should_treat_width_as_auto(Box const&, AvailableSpace const&);
+    static bool should_treat_height_as_auto(Box const&, AvailableSpace const&);
+
     float calculate_fit_content_size(float min_content_size, float max_content_size, AvailableSize const&) const;
 
     OwnPtr<FormattingContext> layout_inside(Box const&, LayoutMode, AvailableSpace const&);