Support showing hidden cards if in developer mode

forge-m-base/src/forge/Forge.java

@@ -99,15 +99,17 @@ public class Forge implements ApplicationListener {
 
     public static void openScreen(FScreen screen0) {
         if (currentScreen == screen0) { return; }
+        if (currentScreen != null && !currentScreen.onSwitchAway()) {
+            return;
+        }
         screens.push(screen0);
         setCurrentScreen(screen0);
-        screen0.onOpen();
     }
 
     private static void setCurrentScreen(FScreen screen0) {
         currentScreen = screen0;
         currentScreen.setSize(screenWidth, screenHeight);
-        currentScreen.onOpen();
+        currentScreen.onActivate();
     }
 
     @Override

forge-m-base/src/forge/screens/FScreen.java

@@ -54,10 +54,10 @@ public abstract class FScreen extends FContainer {
         }
     }
 
-    public void onOpen() {
+    public void onActivate() {
     }
 
-    public boolean onSwitch() {
+    public boolean onSwitchAway() {
         return true;
     }
 

forge-m-base/src/forge/screens/match/FControl.java

@@ -48,6 +48,7 @@ public class FControl {
     private static List<Player> sortedPlayers;
     private static final EventBus uiEvents;
     private static boolean gameHasHumanPlayer;
+    private static boolean devMode;
     private static final MatchUiEventVisitor visitor = new MatchUiEventVisitor();
     private static final FControlGameEventHandler fcVisitor = new FControlGameEventHandler();
     private static final FControlGamePlayback playbackControl = new FControlGamePlayback();
@@ -164,7 +165,13 @@ public class FControl {
             playerPanels.add(new VPlayerPanel(p, localPlayer));
         }
 
-        view = new MatchScreen(playerPanels);
+        view = new MatchScreen(playerPanels) {
+            @Override
+            public void onActivate() {
+                devMode = FModel.getPreferences().getPrefBoolean(FPref.DEV_MODE_ENABLED); //cache devMode for performance when match screen opened
+                super.onActivate();
+            }
+        };
 
         view.getGameDetails().init(players);
     }
@@ -241,7 +248,7 @@ public class FControl {
     }
 
     public static boolean mayShowCard(Card c) {
-        return game == null || !gameHasHumanPlayer || c.canBeShownTo(getCurrentPlayer());
+        return game == null || !gameHasHumanPlayer || devMode || c.canBeShownTo(getCurrentPlayer());
     }
 
     public static void showCombat(Combat combat) {