static @NotNull @NlsSafe String getVersion(@NotNull IdeaPluginDescriptor oldDescriptor,
                                             @NotNull IdeaPluginDescriptor newDescriptor) {
    return String.join(" ",
                       getVersion(oldDescriptor),
                       UIUtil.rightArrow(),
                       getVersion(newDescriptor));
  }
static @NotNull @NlsSafe String getVersion(@NotNull IdeaPluginDescriptor oldDescriptor,
                                             @NotNull IdeaPluginDescriptor newDescriptor)