QmlDesigner: Hide warning when name not modified

Change-Id: I6f52375d029e575582dc8f16abc50c15727bf287
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
(cherry picked from commit ec7cd3051a)
Reviewed-by: Henning Gründl <henning.gruendl@qt.io>

share/qtcreator/qmldesigner/designsystem/Main.qml

@@ -1075,6 +1075,9 @@ Rectangle {
 
         DSC.TextField {
             id: overlayTextField
+
+            property string previousText
+
             anchors.fill: parent
             leftPadding: root.leftPadding + (overlayIcon.visible ? overlayIcon.width + 8 : 0)
 
@@ -1095,8 +1098,7 @@ Rectangle {
                 // Revoke active focus from text field by forcing active focus on another item
                 tableView.forceActiveFocus()
 
-
-                if (!result)
+                if (!result && overlayTextField.previousText !== overlayTextField.text)
                     overlayInvalid.showHeaderData(overlay.section, overlay.orientation)
             }
 
@@ -1151,6 +1153,8 @@ Rectangle {
             overlayTextField.text = tableView.model.headerData(section,
                                                                orientation,
                                                                CollectionModel.EditRole)
+            overlayTextField.previousText = overlayTextField.text
+
             overlayTextField.forceActiveFocus()
             overlayTextField.selectAll()
         }