- fixed ESC pressing on Duke's monitors.

This got busted by an update from GZDoom.

source/common/engine/d_event.cpp

@@ -44,8 +44,6 @@
 #include "gamestate.h"
 #include "i_interface.h"
 
-bool G_Responder(event_t* ev);
-
 int eventhead;
 int eventtail;
 event_t events[MAXEVENTS];
@@ -86,6 +84,9 @@ void D_ProcessEvents (void)
 		if (ev->type == EV_DeviceChange)
 			UpdateJoystickMenu(I_UpdateDeviceList());
 
+		// allow the game to intercept Escape before dispatching it.
+		if (ev->type != EV_KeyDown || ev->data1 != KEY_ESCAPE || !sysCallbacks.WantEscape())
+		{
 			if (gamestate != GS_INTRO) // GS_INTRO blocks the UI.
 			{
 				if (C_Responder(ev))
@@ -93,6 +94,7 @@ void D_ProcessEvents (void)
 				if (M_Responder(ev))
 					continue;				// menu ate the event
 			}
+		}
 
 		if (sysCallbacks.G_Responder(ev) && ev->type == EV_KeyDown) keywasdown.Set(ev->data1);
 	}

source/common/engine/i_interface.h

@@ -46,6 +46,7 @@ struct SystemCallbacks
 	void (*LanguageChanged)(const char*);
 	bool (*OkForLocalization)(FTextureID, const char*);
 	FConfigFile* (*GetConfig)();
+	bool (*WantEscape)();
 };
 
 extern SystemCallbacks sysCallbacks;

source/core/gamecontrol.cpp

@@ -543,6 +543,11 @@ static void System_SetTransition(int type)
 	nextwipe = type;
 }
 
+bool WantEscape()
+{
+	return gi->WantEscape();
+}
+
 
 
 void I_StartupJoysticks();
@@ -592,6 +597,7 @@ int GameMain()
 		nullptr,
 		nullptr,
 		[]() ->FConfigFile* { return GameConfig; },
+		WantEscape,
 	};
 
 	try