Merge pull request #11352 from philcampeau/10069---1871-cannot-crossb…

…uy-after-emergency-issue

[1871] Should not be able to crossbuy after issuing shares

lib/engine/game/g_1871/step/buy_train.rb

@@ -20,9 +20,8 @@ def actions(entity)
 
           def buyable_trains(entity)
             super.reject do |train|
-              entity.id == 'PEIR' &&
-              train.from_depot? &&
-                @round.bought_trains.include?(entity)
+              (entity.id == 'PEIR' && train.from_depot? && @round.bought_trains.include?(entity)) ||
+              (@last_share_issued_price && !train.from_depot?)
             end
           end
 
@@ -69,6 +68,12 @@ def can_sell?(entity, bundle)
 
             selling_minimum_shares?(bundle)
           end
+
+          def process_sell_shares(action)
+            super
+
+            @last_share_issued_price = action.bundle.price_per_share if action.bundle.corporation == current_entity
+          end
         end
       end
     end