fix #937 Select loses focus after selection

Author: vegegoku

domino-ui/src/main/java/org/dominokit/domino/ui/forms/suggest/MultiSelect.java

@@ -154,6 +154,7 @@ protected void onOptionSelected(SelectOption<V> option, boolean silent) {
     updateTextValue();
     fieldInput.appendChild(option);
     selectedOptions.add(option);
+    getInputElement().element().focus();
   }
 
   /**

domino-ui/src/main/java/org/dominokit/domino/ui/forms/suggest/Select.java

@@ -118,6 +118,7 @@ public Select<V> withOption(SelectOption<V> option, boolean silent) {
       }
     }
     autoValidate();
+    getInputElement().element().focus();
     return this;
   }