feat: add constructor allowing to set Popover content (#6558)

Co-authored-by: Sascha Ißbrücker <[email protected]>

vaadin-popover-flow-parent/vaadin-popover-flow/src/main/java/com/vaadin/flow/component/popover/Popover.java

@@ -82,6 +82,18 @@ public Popover() {
         setOverlayRole("dialog");
     }
 
+    /**
+     * Creates a popover with given components inside.
+     *
+     * @param components
+     *            the components inside the popover
+     * @see #add(Component...)
+     */
+    public Popover(Component... components) {
+        this();
+        add(components);
+    }
+
     /**
      * {@code opened-changed} event is sent when the overlay opened state
      * changes.

vaadin-popover-flow-parent/vaadin-popover-flow/src/test/java/com/vaadin/flow/component/popover/PopoverTest.java

@@ -274,4 +274,13 @@ public void setAutofocus_isAutofocus() {
         Assert.assertTrue(popover.isAutofocus());
         Assert.assertTrue(popover.getElement().getProperty("autofocus", false));
     }
+
+    @Test
+    public void popoverWithContent() {
+        Div content = new Div();
+        Popover popoverWithContent = new Popover(content);
+        Assert.assertEquals(1, popoverWithContent.getChildren().count());
+        Assert.assertSame(content,
+                popoverWithContent.getChildren().findFirst().get());
+    }
 }