QmlDesigner: Update states editor icons when element is removed

Schedule a redraw of the states icons when an element is removed from
the model.

Task-number: BAUHAUS-460
Reviewed-by: Christiaan Janssen

src/plugins/qmldesigner/components/stateseditor/stateseditorview.cpp

@@ -261,7 +261,15 @@ void StatesEditorView::nodeAboutToBeRemoved(const ModelNode &removedNode)
           && QmlModelState(removedNode).isValid()) {
         removeModelState(removedNode);
     }
+
     QmlModelView::nodeAboutToBeRemoved(removedNode);
+
+    if (QmlModelState(removedNode).isValid()) {
+        startUpdateTimer(modelStateIndex(removedNode) + 1, 0);
+    } else { //a change to the base state update all
+        for (int i = 0; i < m_modelStates.count(); ++i)
+            startUpdateTimer(i, 0);
+    }
 }