Method windowFocus

src/main/java/field/graphics/Windows.java:120–135

(long window, boolean focused)

			@Override
			public void windowFocus(long window, boolean focused) {
				Runnable r = () -> {
					checkClassLoader();
					GlfwCallback a = adaptors.get(window);
					if (a != null)
						a.windowFocus(window, focused);
				};

				if (checkThread()) r.run();
				else {
					events.addLast(r);
					RunLoop.main.shouldSleep.add(Windows.this);
					RunLoop.main.interrupt();
				}
			}

			@Override
			public void windowRefresh(long window) {
				Runnable r = () -> {
					checkClassLoader();