add border around recipes where several of them stack

src/ui/RecipeLineRow.h

@@ -12,6 +12,7 @@
 class BuildingIconCache;
 class ItemIconCache;
 class QHBoxLayout;
+class QVBoxLayout;
 
 // One recipe drawn: what it consumes, an arrow, what it produces, and how long a cycle
 // takes (REQ-UI-RECIPE-SUMMARY), under a header naming the building that runs it and the
@@ -87,12 +88,20 @@ public:
     // recipe shows no summary at all (REQ-UI-RECIPE-SUMMARY).
     void setLine(const Spec& spec);
 
+    // Boxes the line in a card of its own, for the two places that stack several of them
+    // (REQ-UI-ITEM-TOOLTIP, REQ-DEF-SCHEMATIC-DROP): a run of bare lines reads as one
+    // field of icons and numbers, and the box is what separates one recipe from the next.
+    // Off by default -- a line drawn inside a button or a panel section is already framed
+    // by what holds it.
+    void setCardChrome(bool enabled);
+
 private:
     void rebuild(const Spec& spec);
     void addAmounts(const std::vector<Amount>& amounts);
 
     ItemIconCache*     m_itemIcons;
     BuildingIconCache* m_buildingIcons;
+    QVBoxLayout*       m_outerLayout;
     // The two lines, each a row widget of its own so a rebuild only has to empty their
     // layouts -- no nested layout to take apart. The header is hidden where the spec
     // names neither a building nor a recipe.