Added love.window.isVisible

src/modules/window/sdl/Window.cpp

@@ -310,6 +310,11 @@ bool Window::hasMouseFocus() const
 	return (SDL_GetAppState() & SDL_APPMOUSEFOCUS) != 0;
 }
 
+bool Window::isVisible() const
+{
+	return (SDL_GetAppState() & SDL_APPACTIVE) != 0;
+}
+
 void Window::setMouseVisible(bool visible)
 {
 	SDL_ShowCursor(visible ? SDL_ENABLE : SDL_DISABLE);

src/modules/window/sdl/Window.h

@@ -59,6 +59,8 @@ public:
 	bool hasFocus() const;
 	bool hasMouseFocus() const;
 
+	bool isVisible() const;
+
 	void setMouseVisible(bool visible);
 	bool getMouseVisible() const;