allow to demolish belts and splitters

src/ui/GameWorldView.cpp

@@ -396,6 +396,10 @@ EntityId GameWorldView::buildingAtTile(QPoint tile) const
             if (cell == tile) { return b.id; }
         }
     }
+    for (const BuildingSystem::BeltTileInfo& info : m_sim->buildings().allBeltTiles())
+    {
+        if (info.tile == tile) { return info.id; }
+    }
     return kInvalidEntityId;
 }
 
@@ -778,6 +782,17 @@ void GameWorldView::drawOverlays(QPainter& painter)
                 painter.fillRect(tileRect(cell), m_visuals->overlays.demolishTint);
             }
         }
+        else
+        {
+            for (const BuildingSystem::BeltTileInfo& info : m_sim->buildings().allBeltTiles())
+            {
+                if (info.id == m_demolishHoverId)
+                {
+                    painter.fillRect(tileRect(info.tile), m_visuals->overlays.demolishTint);
+                    break;
+                }
+            }
+        }
     }
 
     // Box-select rectangle
@@ -956,8 +971,9 @@ void GameWorldView::mousePressEvent(QMouseEvent* event)
         if (hovered != kInvalidEntityId)
         {
             const Building* b = m_sim->buildings().findBuilding(hovered);
-            if (b && b->type != BuildingType::Hq
-                  && b->type != BuildingType::PlayerDefenceStation)
+            const bool protected_ = b && (b->type == BuildingType::Hq
+                || b->type == BuildingType::PlayerDefenceStation);
+            if (!protected_)
             {
                 m_sim->buildings().demolish(hovered);
                 m_demolishHoverId = kInvalidEntityId;