Fix Firefox refresh bug

fix firefox bug: when first load page (with input with value set to number with intl dial
code) and initialising plugin removes the dial code from the input, then refresh page,
and we try to init plugin again but this time on number without dial code so get grey flag

build/js/intlTelInput-jquery.js

@@ -448,7 +448,13 @@
         }, {
             key: "_setInitialState",
             value: function _setInitialState() {
-                var val = this.telInput.value;
+                // fix firefox bug: when first load page (with input with value set to number with intl dial
+                // code) and initialising plugin removes the dial code from the input, then refresh page,
+                // and we try to init plugin again but this time on number without dial code so get grey flag
+                var attributeValue = this.telInput.getAttribute("value");
+                var inputValue = this.telInput.value;
+                var useAttribute = attributeValue && attributeValue.charAt(0) === "+" && (!inputValue || inputValue.charAt(0) !== "+");
+                var val = useAttribute ? attributeValue : inputValue;
                 var dialCode = this._getDialCode(val);
                 var isRegionlessNanp = this._isRegionlessNanp(val);
                 var _this$options = this.options, initialCountry = _this$options.initialCountry, nationalMode = _this$options.nationalMode, autoHideDialCode = _this$options.autoHideDialCode, separateDialCode = _this$options.separateDialCode;

build/js/intlTelInput.js

@@ -443,7 +443,13 @@
             }, {
                 key: "_setInitialState",
                 value: function _setInitialState() {
-                    var val = this.telInput.value;
+                    // fix firefox bug: when first load page (with input with value set to number with intl dial
+                    // code) and initialising plugin removes the dial code from the input, then refresh page,
+                    // and we try to init plugin again but this time on number without dial code so get grey flag
+                    var attributeValue = this.telInput.getAttribute("value");
+                    var inputValue = this.telInput.value;
+                    var useAttribute = attributeValue && attributeValue.charAt(0) === "+" && (!inputValue || inputValue.charAt(0) !== "+");
+                    var val = useAttribute ? attributeValue : inputValue;
                     var dialCode = this._getDialCode(val);
                     var isRegionlessNanp = this._isRegionlessNanp(val);
                     var _this$options = this.options, initialCountry = _this$options.initialCountry, nationalMode = _this$options.nationalMode, autoHideDialCode = _this$options.autoHideDialCode, separateDialCode = _this$options.separateDialCode;

src/js/intlTelInput.js

@@ -420,7 +420,13 @@ class Iti {
   // 3. picking the first preferred country
   // 4. picking the first country
   _setInitialState() {
-    const val = this.telInput.value;
+    // fix firefox bug: when first load page (with input with value set to number with intl dial
+    // code) and initialising plugin removes the dial code from the input, then refresh page,
+    // and we try to init plugin again but this time on number without dial code so get grey flag
+    const attributeValue = this.telInput.getAttribute('value');
+    const inputValue = this.telInput.value;
+    const useAttribute = (attributeValue && attributeValue.charAt(0) === '+' && (!inputValue || inputValue.charAt(0) !== '+'));
+    const val = useAttribute ? attributeValue : inputValue;
     const dialCode = this._getDialCode(val);
     const isRegionlessNanp = this._isRegionlessNanp(val);
     const {