- move mutableLoading data property to ajax mixin

- open dropdown only when not loading
- add watcher to keep loading synced with mutableLoading

src/components/Select.vue

@@ -488,8 +488,7 @@
         search: '',
         open: false,
         mutableValue: null,
-        mutableOptions: [],
-				mutableLoading: false
+        mutableOptions: []
       }
     },
 
@@ -765,7 +764,7 @@
        * @return {Boolean} True if open
        */
       dropdownOpen() {
-        return this.noDrop ? false : this.open
+        return this.noDrop ? false : this.open && !this.mutableLoading
       },
 
       /**