[+] Add CPreference::PauseOnLeave parameter to control the game pause when the window is inactive

src/include/unit.h

@@ -417,13 +417,15 @@ class CPreference
 public:
 	CPreference() : ShowSightRange(false), ShowReactionRange(false),
 		ShowAttackRange(false), ShowMessages(true),
-		BigScreen(false), ShowOrders(0), ShowNameDelay(0), ShowNameTime(0) {};
+		BigScreen(false), PauseOnLeave(true),  ShowOrders(0), ShowNameDelay(0),
+		ShowNameTime(0) {};
 
 	bool ShowSightRange;     /// Show sight range.
 	bool ShowReactionRange;  /// Show reaction range.
 	bool ShowAttackRange;    /// Show attack range.
 	bool ShowMessages;		 /// Show messages.
 	bool BigScreen;			 /// If true, shows the big screen(without panels)
+	bool PauseOnLeave;       /// If true, game pauses when cursor is gone
 
 	int  ShowOrders;         /// How many second show orders of unit on map.
 	int  ShowNameDelay;      /// How many cycles need to wait until unit's name popup will appear.

src/tolua/unit.pkg

@@ -22,6 +22,7 @@ class CPreference
 	bool ShowAttackRange;
 	bool ShowMessages;
 	bool BigScreen;
+	bool PauseOnLeave;
 
 	unsigned int ShowOrders;
 	unsigned int  ShowNameDelay;

src/video/sdl.cpp

@@ -94,6 +94,7 @@
 #include "sound_server.h"
 #include "translate.h"
 #include "ui.h"
+#include "unit.h"
 #include "video.h"
 #include "widgets.h"
 
@@ -860,7 +861,7 @@ static void SdlDoEvent(const EventCallback &callbacks, SDL_Event &event)
 				}
 				InMainWindow = (event.active.gain != 0);
 			}
-			if (event.active.state & SDL_APPACTIVE || SDL_GetAppState() & SDL_APPACTIVE) {
+			if (Preference.PauseOnLeave && (event.active.state & SDL_APPACTIVE || SDL_GetAppState() & SDL_APPACTIVE)) {
 				static bool DoTogglePause = false;
 
 				if (IsSDLWindowVisible && !event.active.gain) {