fix(ngOptions): always set the 'selected' attribute for selected options

We don't set selected property / attribute on options that are already selected.
That happens for example if the browser has automatically selected the first
option in a select. In that case, the selected property is set automatically, but
the selected attribute is not

Closes angular#14115

Author: Narretz

src/ng/directive/ngOptions.js

@@ -468,13 +468,17 @@ var ngOptionsDirective = ['$compile', '$parse', function($compile, $parse) {
           var option = options.getOptionFromViewValue(value);
 
           if (option && !option.disabled) {
+            // Don't update the option when it is already selected.
+            // For example, the browser will select the first option by default. In that case,
+            // most properties are set automatically - except the `selected` attribute.
+            option.element.setAttribute('selected', 'selected');
+
             if (selectElement[0].value !== option.selectValue) {
               removeUnknownOption();
               removeEmptyOption();
 
               selectElement[0].value = option.selectValue;
               option.element.selected = true;
-              option.element.setAttribute('selected', 'selected');
             }
           } else {
             if (value === null || providedEmptyOption) {