Add check to pause game on lost window focus

builtin/settingtypes.txt

@@ -536,6 +536,9 @@ fps_max (Maximum FPS) int 60
#    Maximum FPS when game is paused.
pause_fps_max (FPS in pause menu) int 20

#    Open the pause menu when the window's focus is lost. Does not pause if a formspec is open.
pause_on_lost_focus (Pause on lost window focus) bool false

#    View distance in nodes.
viewing_range (Viewing range) int 100 20 4000

minetest.conf.example

@@ -994,6 +994,10 @@
#    type: int
# max_out_chat_queue_size = 20

#    Open the pause menu when the window's focus is lost. Does not pause if a formspec is open.
#    type: bool
# pause_on_lost_focus = false

## Advanced

#    Timeout for client to remove unused map data from memory.

src/defaultsettings.cpp

@@ -58,6 +58,7 @@ void set_default_settings(Settings *settings)
	settings->setDefault("enable_remote_media_server", "true");
	settings->setDefault("enable_client_modding", "false");
	settings->setDefault("max_out_chat_queue_size", "20");
	settings->setDefault("pause_on_lost_focus", "false");

	// Keymap
	settings->setDefault("remote_port", "30000");

src/game.cpp

@@ -1487,6 +1487,8 @@ class Game {
	bool m_first_loop_after_window_activation = false;
	bool m_camera_offset_changed = false;

	bool m_does_lost_focus_pause_game = false;

#ifdef __ANDROID__
	bool m_cache_hold_aux1;
	bool m_android_chat_open;
@@ -1741,6 +1743,10 @@ void Game::run()

		// Update if minimap has been disabled by the server
		flags.show_minimap &= client->shouldShowMinimap();

		if (m_does_lost_focus_pause_game && !device->isWindowFocused() && !isMenuActive()) {
			showPauseMenu();
		}
	}
}

@@ -4638,6 +4644,7 @@ void Game::readSettings()
	m_cache_cam_smoothing = rangelim(m_cache_cam_smoothing, 0.01f, 1.0f);
	m_cache_mouse_sensitivity = rangelim(m_cache_mouse_sensitivity, 0.001, 100.0);

	m_does_lost_focus_pause_game = g_settings->getBool("pause_on_lost_focus");
}

/****************************************************************************/