QmlDesigner: Properly reset line edits if an error occurs

Task-number: QDS-707
Change-Id: Ic70c4296afd8bd6b590242fea129624af2fee7a6
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/qmldesigner/qmldesignerextension/timelineeditor/timelineanimationform.cpp

@@ -85,14 +85,23 @@ TimelineAnimationForm::TimelineAnimationForm(QWidget *parent)
         if (newId == animation().id())
             return;
 
-        if (!animation().isValidId(newId)) {
+        bool error = false;
+
+        if (!ModelNode::isValidId(newId)) {
             Core::AsynchronousMessageBox::warning(tr("Invalid Id"),
                                                   tr("%1 is an invalid id.").arg(newId));
+            error = true;
         } else if (animation().view()->hasId(newId)) {
             Core::AsynchronousMessageBox::warning(tr("Invalid Id"),
                                                   tr("%1 already exists.").arg(newId));
         } else {
             animation().setIdWithRefactoring(newId);
+            error = true;
+        }
+
+        if (error) {
+            lastString.clear();
+            ui->idLineEdit->setText(animation().id());
         }
     });
 

src/plugins/qmldesigner/qmldesignerextension/timelineeditor/timelineform.cpp

@@ -98,15 +98,24 @@ TimelineForm::TimelineForm(QWidget *parent)
         if (newId == m_timeline.modelNode().id())
             return;
 
-        if (!m_timeline.modelNode().isValidId(newId)) {
+        bool error = false;
+
+        if (!ModelNode::isValidId(newId)) {
             Core::AsynchronousMessageBox::warning(tr("Invalid Id"),
                                                   tr("%1 is an invalid id.").arg(newId));
+            error = true;
         } else if (m_timeline.view()->hasId(newId)) {
             Core::AsynchronousMessageBox::warning(tr("Invalid Id"),
                                                   tr("%1 already exists.").arg(newId));
+            error = true;
         } else {
             m_timeline.modelNode().setIdWithRefactoring(newId);
         }
+
+        if (error) {
+            lastString.clear();
+            ui->idLineEdit->setText(m_timeline.modelNode().id());
+        }
     });
 
     connectSpinBox(ui->startFrame, "startFrame");