Add preference to enable/disable mana pool emptying prompt.

forge-gui-desktop/src/main/java/forge/screens/home/settings/CSubmenuPreferences.java

@@ -108,6 +108,7 @@ public enum CSubmenuPreferences implements ICDoc {
         lstControls.add(Pair.of(view.getCbHideReminderText(), FPref.UI_HIDE_REMINDER_TEXT));
         lstControls.add(Pair.of(view.getCbOpenPacksIndiv(), FPref.UI_OPEN_PACKS_INDIV));
         lstControls.add(Pair.of(view.getCbStackCreatures(), FPref.UI_STACK_CREATURES));
+        lstControls.add(Pair.of(view.getCbManaLostPrompt(), FPref.UI_MANA_LOST_PROMPT));
 
         for(final Pair<JCheckBox, FPref> kv : lstControls) {
             kv.getKey().addItemListener(new ItemListener() {

forge-gui-desktop/src/main/java/forge/screens/home/settings/VSubmenuPreferences.java

@@ -83,6 +83,7 @@ public enum VSubmenuPreferences implements IVSubmenu<CSubmenuPreferences> {
     private final JCheckBox cbHideReminderText = new OptionsCheckBox("Hide Reminder Text");
     private final JCheckBox cbOpenPacksIndiv = new OptionsCheckBox("Open Packs Individually");
     private final JCheckBox cbStackCreatures = new OptionsCheckBox("Stack Creatures");
+    private final JCheckBox cbManaLostPrompt = new OptionsCheckBox("Prompt Mana Pool Emptying");
 
     private final Map<FPref, KeyboardShortcutField> shortcutFields = new HashMap<FPref, KeyboardShortcutField>();
 
@@ -155,6 +156,9 @@ public enum VSubmenuPreferences implements IVSubmenu<CSubmenuPreferences> {
 
         pnlPrefs.add(cbPromptFreeBlocks, regularConstraints);
         pnlPrefs.add(new NoteLabel("When enabled, if you would have to pay 0 to block, pay automatically without prompt."), regularConstraints);
+        
+        pnlPrefs.add(cbManaLostPrompt, regularConstraints);
+        pnlPrefs.add(new NoteLabel("When enabled, you get a warning if passing priority would cause you to lose mana in your mana pool."), regularConstraints);
 
         // Deck building options
         pnlPrefs.add(new SectionLabel("Random Deck Generation"), sectionConstraints);
@@ -543,6 +547,10 @@ public enum VSubmenuPreferences implements IVSubmenu<CSubmenuPreferences> {
     public final JCheckBox getCbStackCreatures() {
         return cbStackCreatures;
     }
+    
+    public final JCheckBox getCbManaLostPrompt() {
+    	return cbManaLostPrompt;
+    }
 
     /** @return {@link forge.toolbox.FLabel} */
     public FLabel getBtnReset() {

forge-gui/src/main/java/forge/match/input/InputPassPriority.java

@@ -95,7 +95,7 @@ public class InputPassPriority extends InputSyncronizedBase {
         Game game = GuiBase.getInterface().getGame();
         if (game.getStack().isEmpty()) { //phase can't end right now if stack isn't empty
             Player player = game.getPhaseHandler().getPriorityPlayer();
-            if (player != null && player.getManaPool().willManaBeLostAtEndOfPhase() && player.getLobbyPlayer() == GuiBase.getInterface().getGuiPlayer()) {
+            if (player != null && FModel.getPreferences().getPrefBoolean(FPref.UI_MANA_LOST_PROMPT) && player.getManaPool().willManaBeLostAtEndOfPhase() && player.getLobbyPlayer() == GuiBase.getInterface().getGuiPlayer()) {
                 ThreadUtil.invokeInGameThread(new Runnable() { //must invoke in game thread so dialog can be shown on mobile game
                     @Override
                     public void run() {

forge-gui/src/main/java/forge/properties/ForgePreferences.java

@@ -72,6 +72,7 @@ public class ForgePreferences extends PreferencesStore<ForgePreferences.FPref> {
         UI_LOCK_TITLE_BAR ("false"),
         UI_HIDE_GAME_TABS ("false"),                // Visibility of tabs in match screen.
         UI_CLOSE_ACTION ("NONE"),
+        UI_MANA_LOST_PROMPT ("false"),				// Prompt on losing mana when passing priority
 
         UI_FOR_TOUCHSCREN("false"),