Method code for $root.set_setting_attr()

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---

  1: arg name, attr, value;
  2: var info;
  3: 
  4: (> .perms(sender()) <);
  5: if (!defined_settings || !dict_contains(defined_settings, name))
  6:     throw(~setnf, "Setting \"" + name + "\" is not defined on " + this());
  7: if (value && !(> .valid_setting_attr(attr, value) <))
  8:     return;
  9: info = defined_settings[name];
 10: if (!value)
 11:     info = dict_del(info, attr);
 12: else
 13:     info = dict_add(info, attr, value);
 14: defined_settings = dict_add(defined_settings, name, info);

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