Set preferredCountries with onlyCountries (#492)

Author: david58

src/index.js

@@ -486,7 +486,7 @@ class PhoneInput extends React.Component {
  e.preventDefault();
  if (!this.state.showDropdown && this.props.disabled) return;
  const { preferredCountries, selectedCountry } = this.state
- const allCountries = preferredCountries.concat(this.state.onlyCountries)
+ const allCountries =  [...new Set(preferredCountries.concat(this.state.onlyCountries))];
 
  const highlightCountryIndex = allCountries.findIndex(o =>
  o.dialCode === selectedCountry.dialCode && o.iso2 === selectedCountry.iso2);
@@ -764,7 +764,7 @@ class PhoneInput extends React.Component {
  getSearchFilteredCountries = () => {
  const { preferredCountries, onlyCountries, searchValue } = this.state
  const { enableSearch } = this.props
- const allCountries = preferredCountries.concat(onlyCountries);
+ const allCountries = [...new Set(preferredCountries.concat(onlyCountries))];
  const sanitizedSearchValue = searchValue.trim().toLowerCase();
  if (enableSearch && sanitizedSearchValue) {
  // [...new Set()] to get rid of duplicates