docs: public static void setDefaultTooltipManager(final TooltipManager tooltipManager) {
          try {
              // We have to set the app field, as it is validated by the static getter.
              Reflection.setFieldValue(ClassReflection.getDeclaredField(TooltipManager.class, "app"), null, Gdx.app);
              Reflection.setFieldValue(ClassReflection.getDeclaredField(TooltipManager.class, "instance"), null,
                      tooltipManager);
          } catch (final ReflectionException exception) {
              throw new GdxRuntimeException("Unable to set default tooltip manager.", exception);
          }
      }