Menu Messages: Call the routine after it closes, not the moment you press the button

Slicker, prevents the issue where a transition after pressing accept on a prompt would be instant.
Also guarantees M_StopMessage is called even for MM_NOTHING, even with a custom routine.

src/k_menu.h

@@ -533,6 +533,7 @@ extern struct menumessage_s
 
 	void (*routine)(INT32 choice);	// Normal routine
 	//void (*eroutine)(event_t *ev);	// Event routine	(MM_EVENTHANDLER)
+	INT32 answer;
 
 	const char *defaultstr;
 	const char *confirmstr;

src/menus/extras-addons.c

@@ -101,11 +101,12 @@ static boolean prevmajormods = false;
 
 static void M_AddonsClearName(INT32 choice)
 {
+	(void)choice;
+
 	if (!majormods || prevmajormods)
 	{
 		CLEARNAME;
 	}
-	M_StopMessage(choice);
 }
 
 // Handles messages for addon errors.

src/menus/play-local-race-time-attack.c

@@ -414,7 +414,6 @@ static void M_WriteGuestReplay(INT32 ch)
 
 	if (FIL_FileExists(rguest))
 	{
-		//M_StopMessage(0);
 		remove(rguest);
 	}
 

src/menus/transient/message-box.c

@@ -71,6 +71,7 @@ void M_StartMessage(const char *header, const char *string, void (*routine)(INT3
 	menumessage.header = header;
 	menumessage.flags = itemtype;
 	menumessage.routine = routine;
+	menumessage.answer = MA_NONE;
 	menumessage.fadetimer = 1;
 	menumessage.timer = 0;
 	menumessage.closing = false;
@@ -82,7 +83,6 @@ void M_StartMessage(const char *header, const char *string, void (*routine)(INT3
 	if (!routine)
 	{
 		menumessage.flags = MM_NOTHING;
-		menumessage.routine = M_StopMessage;
 	}
 
 	if (menumessage.flags == MM_YESNO && !defaultstr)
@@ -156,6 +156,11 @@ boolean M_MenuMessageTick(void)
 		if (menumessage.fadetimer == 0)
 		{
 			menumessage.active = false;
+
+			if (menumessage.routine)
+			{
+				menumessage.routine(menumessage.answer);
+			}
 		}
 
 		return false;
@@ -183,38 +188,24 @@ void M_HandleMenuMessage(void)
 
 	switch (menumessage.flags)
 	{
-		// Send 1 to the routine if we're pressing A/B/X
-		case MM_NOTHING:
-		{
-			if (btok || btnok)
-				menumessage.routine(0);
-
-			break;
-		}
 		// Send 1 to the routine if we're pressing A, 2 if B/X, 0 otherwise.
 		case MM_YESNO:
 		{
-			INT32 answer = MA_NONE;
 			if (btok)
-				answer = MA_YES;
+				menumessage.answer = MA_YES;
 			else if (btnok)
-				answer = MA_NO;
-
-			// send 1 if btok is pressed, 2 if nok is pressed, 0 otherwise.
-			if (answer)
-			{
-				menumessage.routine(answer);
-				M_StopMessage(0);
-			}
+				menumessage.answer = MA_NO;
 
 			break;
 		}
-		// MM_EVENTHANDLER: In M_Responder to allow full event compat.
 		default:
 			break;
 	}
 
 	// if we detect any keypress, don't forget to set the menu delay regardless.
 	if (btok || btnok)
+	{
+		M_StopMessage(0);
 		M_SetMenuDelay(pid);
+	}
 }

src/menus/transient/pause-game.c

@@ -358,6 +358,8 @@ void M_ConfirmEnterGame(INT32 choice)
 
 static void M_ExitGameResponse(INT32 ch)
 {
+	const UINT8 pid = 0;
+
 	if (ch != MA_YES)
 		return;
 
@@ -368,7 +370,7 @@ static void M_ExitGameResponse(INT32 ch)
 	else
 	{
 		G_SetExitGameFlag();
-		M_ClearMenus(true);
+		M_SetMenuDelay(pid); // prevent another input
 	}
 }