LibWeb: Refactor should_skip_anonymous_text_runs

This same function was being copied in the {Flex,Grid}FormattingContext,
so unify them in the parent FormattingContext.

Userland/Libraries/LibWeb/Layout/FlexFormattingContext.cpp

@@ -305,19 +305,8 @@ void FlexFormattingContext::generate_anonymous_flex_items()
     HashMap<int, Vector<FlexItem>> order_item_bucket;
 
     flex_container().for_each_child_of_type<Box>([&](Box& child_box) {
-        // Skip anonymous text runs that are only whitespace.
-        if (child_box.is_anonymous() && !child_box.is_generated() && !child_box.first_child_of_type<BlockContainer>()) {
-            bool contains_only_white_space = true;
-            child_box.for_each_in_subtree([&](auto const& node) {
-                if (!is<TextNode>(node) || !static_cast<TextNode const&>(node).dom_node().data().is_whitespace()) {
-                    contains_only_white_space = false;
-                    return IterationDecision::Break;
-                }
-                return IterationDecision::Continue;
-            });
-            if (contains_only_white_space)
-                return IterationDecision::Continue;
-        }
+        if (can_skip_is_anonymous_text_run(child_box))
+            return IterationDecision::Continue;
 
         // Skip any "out-of-flow" children
         if (child_box.is_out_of_flow(*this))

Userland/Libraries/LibWeb/Layout/FormattingContext.cpp

@@ -1473,4 +1473,21 @@ bool FormattingContext::should_treat_height_as_auto(Box const& box, AvailableSpa
         || (box.computed_values().height().contains_percentage() && !available_space.height.is_definite());
 }
 
+bool FormattingContext::can_skip_is_anonymous_text_run(Box& box)
+{
+    if (box.is_anonymous() && !box.is_generated() && !box.first_child_of_type<BlockContainer>()) {
+        bool contains_only_white_space = true;
+        box.for_each_in_subtree([&](auto const& node) {
+            if (!is<TextNode>(node) || !static_cast<TextNode const&>(node).dom_node().data().is_whitespace()) {
+                contains_only_white_space = false;
+                return IterationDecision::Break;
+            }
+            return IterationDecision::Continue;
+        });
+        if (contains_only_white_space)
+            return true;
+    }
+    return false;
+}
+
 }

Userland/Libraries/LibWeb/Layout/FormattingContext.h

@@ -81,6 +81,7 @@ public:
     virtual void determine_height_of_child(Box const&, AvailableSpace const&) { }
 
     virtual Gfx::FloatPoint calculate_static_position(Box const&) const;
+    bool can_skip_is_anonymous_text_run(Box&);
 
 protected:
     FormattingContext(Type, LayoutState&, Box const&, FormattingContext* parent = nullptr);

Userland/Libraries/LibWeb/Layout/GridFormattingContext.cpp

@@ -22,21 +22,6 @@ void GridFormattingContext::run(Box const& box, LayoutMode, AvailableSpace const
     auto& box_state = m_state.get_mutable(box);
     auto grid_template_columns = box.computed_values().grid_template_columns();
     auto grid_template_rows = box.computed_values().grid_template_rows();
-    auto should_skip_is_anonymous_text_run = [&](Box& child_box) -> bool {
-        if (child_box.is_anonymous() && !child_box.first_child_of_type<BlockContainer>()) {
-            bool contains_only_white_space = true;
-            child_box.for_each_in_subtree([&](auto const& node) {
-                if (!is<TextNode>(node) || !static_cast<TextNode const&>(node).dom_node().data().is_whitespace()) {
-                    contains_only_white_space = false;
-                    return IterationDecision::Break;
-                }
-                return IterationDecision::Continue;
-            });
-            if (contains_only_white_space)
-                return true;
-        }
-        return false;
-    };
 
     auto resolve_definite_track_size = [&](CSS::GridSize const& grid_size) -> float {
         VERIFY(grid_size.is_definite());
@@ -110,7 +95,7 @@ void GridFormattingContext::run(Box const& box, LayoutMode, AvailableSpace const
     Vector<PositionedBox> positioned_boxes;
     Vector<Box const&> boxes_to_place;
     box.for_each_child_of_type<Box>([&](Box& child_box) {
-        if (should_skip_is_anonymous_text_run(child_box))
+        if (can_skip_is_anonymous_text_run(child_box))
             return IterationDecision::Continue;
         boxes_to_place.append(child_box);
         return IterationDecision::Continue;