QmlDesigner.propertyEditor: add buttons for alignment

share/qtcreator/qmldesigner/propertyeditor/Qt/StandardTextGroupBox.qml

@@ -35,31 +35,15 @@ GroupBox {
                 }
             }
         }
+
         QWidget {
             layout: HorizontalLayout {
 
                 Label {
                     text: "Alignment"
                 }
-                ComboBox {
-                    baseStateFlag: isBaseState;
-                    items : { ["AlignLeft", "AlignRight", "AlignHCenter"] }
-                    backendValue: backendValues.horizontalAlignment;
-                    currentText: backendValues.horizontalAlignment.value;
-                    onItemsChanged: {
-                        currentText =  backendValues.horizontalAlignment.value;
-                    }
-
-                }
-                ComboBox {
-                    baseStateFlag: isBaseState;
-                    items : { ["AlignTop", "AlignBottom", "AlignVCenter"] }
-                    backendValue: backendValues.verticalAlignment;
-                    currentText: backendValues.verticalAlignment.value;
-                    onItemsChanged: {
-                        currentText =  backendValues.verticalAlignment.value;
-                    }
-                }
+                AlignmentHorizontalButtons {}
+                AlignmentVerticalButtons {}
             }
         }