LibWeb: Fix sometimes missing text selection highlight

There's no selection if it starts and ends at the same column, but only
if both columns are in the same node. :^)

Libraries/LibWeb/Layout/LineBoxFragment.cpp

@@ -116,9 +116,6 @@ Gfx::FloatRect LineBoxFragment::selection_rect(const Gfx::Font& font) const
     const auto end_index = m_start + m_length;
     auto text = this->text();
 
-    if (selection.start().index_in_node == selection.end().index_in_node)
-        return {};
-
     if (layout_node().selection_state() == LayoutNode::SelectionState::StartAndEnd) {
         // we are in the start/end node (both the same)
         if (start_index > selection.end().index_in_node)
@@ -126,6 +123,9 @@ Gfx::FloatRect LineBoxFragment::selection_rect(const Gfx::Font& font) const
         if (end_index < selection.start().index_in_node)
             return {};
 
+        if (selection.start().index_in_node == selection.end().index_in_node)
+            return {};
+
         auto selection_start_in_this_fragment = max(0, selection.start().index_in_node - m_start);
         auto selection_end_in_this_fragment = min(m_length, selection.end().index_in_node - m_start);
         auto pixel_distance_to_first_selected_character = font.width(text.substring_view(0, selection_start_in_this_fragment));