bugfix: correctly revert manual cases even when rotate_next_draw was used

include/game_state.hpp

@@ -386,10 +386,18 @@ namespace Hanabi {
               }
             } else
             {
-              if (!_draw_pile.empty() and _draw_pile.front().card.suit == drawn.suit and
-                  _draw_pile.front().card.rank == drawn.rank) {
-                _draw_pile.front().multiplicity++;
-              } else {
+              // We don't know where the card came from (between the card having been removed from the draw pile
+              // and re-adding it now, the user may have arbitrarily permuted the draw pile implicitly)
+              // so we have to check if it is already contained in the draw pile somewhere
+              auto it = std::find_if(_draw_pile.begin(), _draw_pile.end(), [&drawn](CardMultiplicity const & mult){
+                return mult.card == drawn;
+              });
+              if (it != _draw_pile.end())
+              {
+                it->multiplicity++;
+              }
+              else
+              {
                 _draw_pile.push_front({drawn, 1});
               }
             }