@NotNull
  <T extends XBreakpointProperties> XBreakpoint<T> addBreakpoint(XBreakpointType<XBreakpoint<T>, T> type, @Nullable T properties);
@NotNull
  <T extends XBreakpointProperties> XBreakpoint<T> addBreakpoint(XBreakpointType<XBreakpoint<T>, T> type, @Nullable T properties)