LibCards+Games: Move mark_intersecting_stacks_dirty() to CardGame

As part of this, made a const overload for `Card::rect()`. We need the
non-const one too as it's used for modifying the position of a card
that's being dragged. I plan on changing that soon but we'll see.

Userland/Games/Solitaire/Game.cpp

@@ -521,16 +521,6 @@ void Game::auto_move_eligible_cards_to_foundations()
         auto_move_eligible_cards_to_foundations();
 }
 
-void Game::mark_intersecting_stacks_dirty(Card& intersecting_card)
-{
-    for (auto& stack : stacks()) {
-        if (intersecting_card.rect().intersects(stack.bounding_box()))
-            update(stack.bounding_box());
-    }
-
-    update(intersecting_card.rect());
-}
-
 void Game::paint_event(GUI::PaintEvent& event)
 {
     Gfx::Color background_color = this->background_color();

Userland/Games/Solitaire/Game.h

@@ -159,7 +159,6 @@ private:
         }
     }
 
-    void mark_intersecting_stacks_dirty(Card& intersecting_card);
     void score_move(CardStack& from, CardStack& to, bool inverse = false);
     void score_flip(bool inverse = false);
     void remember_move_for_undo(CardStack& from, CardStack& to, NonnullRefPtrVector<Card> moved_cards);

Userland/Games/Spider/Game.cpp

@@ -105,16 +105,6 @@ void Game::draw_cards()
     start_timer(s_timer_interval_ms);
 }
 
-void Game::mark_intersecting_stacks_dirty(Card& intersecting_card)
-{
-    for (auto& stack : stacks()) {
-        if (intersecting_card.rect().intersects(stack.bounding_box()))
-            update(stack.bounding_box());
-    }
-
-    update(intersecting_card.rect());
-}
-
 void Game::detect_full_stacks()
 {
     auto& completed_stack = stack_at_location(Completed);

Userland/Games/Spider/Game.h

@@ -70,7 +70,6 @@ private:
     void start_timer_if_necessary();
     void update_score(int delta);
     void draw_cards();
-    void mark_intersecting_stacks_dirty(Card& intersecting_card);
     void detect_full_stacks();
     void detect_victory();
     void move_focused_cards(CardStack& stack);

Userland/Libraries/LibCards/Card.h

@@ -88,6 +88,7 @@ public:
     virtual ~Card() override = default;
 
     Gfx::IntRect& rect() { return m_rect; }
+    Gfx::IntRect const& rect() const { return m_rect; }
     Gfx::IntPoint position() const { return m_rect.location(); }
     Gfx::IntPoint const& old_position() const { return m_old_position; }
     Rank rank() const { return m_rank; };

Userland/Libraries/LibCards/CardGame.cpp

@@ -22,6 +22,16 @@ void CardGame::add_stack(NonnullRefPtr<CardStack> stack)
     m_stacks.append(move(stack));
 }
 
+void CardGame::mark_intersecting_stacks_dirty(Cards::Card const& intersecting_card)
+{
+    for (auto& stack : stacks()) {
+        if (intersecting_card.rect().intersects(stack.bounding_box()))
+            update(stack.bounding_box());
+    }
+
+    update(intersecting_card.rect());
+}
+
 void CardGame::dump_layout() const
 {
     dbgln("------------------------------");

Userland/Libraries/LibCards/CardGame.h

@@ -25,6 +25,7 @@ public:
     NonnullRefPtrVector<CardStack> const& stacks() const { return m_stacks; }
     CardStack& stack_at_location(int location) { return m_stacks[location]; }
     void add_stack(NonnullRefPtr<CardStack>);
+    void mark_intersecting_stacks_dirty(Card const& intersecting_card);
 
     void dump_layout() const;