Fixed #2619 - Add a param to the show() method to focus Dropdown component

src/components/dropdown/Dropdown.vue

@@ -238,9 +238,11 @@ export default {
         isSelected(option) {
             return ObjectUtils.equals(this.modelValue, this.getOptionValue(option), this.equalityKey);
         },
-        show() {
+        show(isFocus) {
             this.$emit('before-show');
             this.overlayVisible = true;
+
+            isFocus && this.$refs.focusInput.focus();
         },
         hide() {
             this.$emit('before-hide');

src/views/dropdown/DropdownDoc.vue

@@ -379,7 +379,7 @@ export default {
 				<tbody>
                     <tr>
                         <td>show</td>
-                        <td>-</td>
+                        <td>isFocus: Decides whether to focus on the component. Default value is false.</td>
                         <td>Shows the overlay.</td>
                     </tr>
                     <tr>