fix bug where demolishing construction sites was not possible

src/ui/GameWorldView.cpp

@@ -393,12 +393,31 @@ EntityId GameWorldView::buildingAtTile(QPoint tile) const
     {
         for (const QPoint& cell : b.bodyCells)
         {
-            if (cell == tile) { return b.id; }
+            if (cell == tile) 
+			{ 
+				return b.id; 
+			}
         }
     }
     return kInvalidEntityId;
 }
 
+EntityId GameWorldView::siteAtTile(QPoint tile) const
+{
+	for (const ConstructionSite& s : m_sim->buildings().allSites())
+	{
+		for (const QPoint& cell : s.bodyCells)
+		{
+			if (cell == tile) 
+			{
+				return s.id; 
+			}
+		}
+	}
+	return kInvalidEntityId;
+}
+
+
 std::optional<QVector2D> GameWorldView::entityPosition(EntityId id) const
 {
     const Ship* ship = m_sim->ships().findShip(id);
@@ -435,14 +454,23 @@ void GameWorldView::stepSpeed(int delta)
 
 void GameWorldView::placeAtTile(QPoint tile)
 {
-    if (!m_builderType.has_value()) { return; }
+    if (!m_builderType.has_value())
+	{ 
+		return; 
+	}
     const BuildingType type = *m_builderType;
 
-    if (!isValidPlacement(type, tile, m_ghostRotation)) { return; }
+    if (!isValidPlacement(type, tile, m_ghostRotation))
+	{ 
+		return; 
+	}
 
     if (type == BuildingType::Belt)
     {
-        if (m_beltDragTiles.count(tile) > 0) { return; }
+        if (m_beltDragTiles.count(tile) > 0)
+		{ 
+			return;
+		}
         if (!m_sim->buildings().isTileOccupied(tile))
         {
             const EntityId id = m_sim->tryPlaceBuilding(
@@ -914,13 +942,17 @@ void GameWorldView::mousePressEvent(QMouseEvent* event)
     }
     else if (m_demolishMode)
     {
-        const EntityId hovered = buildingAtTile(tile);
+        EntityId hovered = buildingAtTile(tile);
+		if (hovered == kInvalidEntityId)
+		{
+			hovered = siteAtTile(tile);
+		}
         if (hovered != kInvalidEntityId)
         {
             const Building* b = m_sim->buildings().findBuilding(hovered);
-            const bool protected_ = b && (b->type == BuildingType::Hq
+            const bool isProtected = b && (b->type == BuildingType::Hq
                 || b->type == BuildingType::PlayerDefenceStation);
-            if (!protected_)
+            if (!isProtected)
             {
                 m_sim->demolish(hovered);
                 m_demolishHoverId = kInvalidEntityId;

src/ui/GameWorldView.h

@@ -96,6 +96,7 @@ private:
     bool     isValidPlacement(BuildingType type, QPoint anchor, Rotation rot) const;
     const BuildingDef* findBuildingDef(BuildingType type) const;
     EntityId buildingAtTile(QPoint tile) const;
+    EntityId siteAtTile(QPoint tile) const;
 
     void     drawPortGlyph(QPainter& painter, QPoint bodyTile,
                            Rotation direction, const QColor& color);