Fix combobox adding new items on blur (#9660)

Fixes #9071

client/src/main/java/com/vaadin/client/ui/VComboBox.java

 
         focused = false;
         updatePlaceholder();
+        removeStyleDependentName("focus");
+
+        // Send new items when clicking out with the mouse.
         if (!readonly) {
-            reset();
+            if (textInputEnabled && allowNewItems
+                    && (currentSuggestion == null || tb.getText().equals(
+                            currentSuggestion.getReplacementString()))) {
+                dataReceivedHandler.reactOnInputWhenReady(tb.getText());
+            } else {
+                reset();
+            }
             suggestionPopup.hide();
         }
-        removeStyleDependentName("focus");
 
         connector.sendBlurEvent();
     }

uitest/src/test/java/com/vaadin/tests/components/combobox/ComboBoxSelectingWithNewItemsAllowedTest.java

 import org.junit.Test;
 import org.openqa.selenium.Keys;
 import org.openqa.selenium.WebDriver;
+import org.openqa.selenium.interactions.Actions;
 import org.openqa.selenium.support.ui.ExpectedCondition;
 
 import com.vaadin.testbench.By;
         assertThatSelectedValueIs("a");
     }
 
+    @Test
+    public void itemIsAddedWithClickOut() {
+        typeInputAndClickOut("a");
+
+        assertOneMoreThanInitial();
+        assertThatSelectedValueIs("a");
+    }
+
     @Test
     public void matchingSuggestionIsSelectedWithEnter() {
         typeInputAndHitEnter("a0");
         sendKeysToInput(Keys.TAB);
     }
 
+    private void typeInputAndClickOut(String input) {
+        clearInputAndType(input);
+        new Actions(getDriver()).moveToElement(comboBoxElement, 10, 10)
+                .moveByOffset(comboBoxElement.getSize().getWidth(), 0).click()
+                .perform();
+    }
+
     private void clearInputAndType(String input) {
         comboBoxElement.clear();
         sendKeysToInput(input);