QmlDesigner: Trim state name

States should never have trailing white spaces.

Change-Id: I67dc08e12fa042a237ede3d2d0247e6ea2b55eff
Reviewed-by: Aleksei German <aleksei.german@qt.io>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

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

@@ -298,7 +298,7 @@ void StatesEditorView::renameState(int internalNodeId, const QString &newName)
                 setCurrentState(baseState());
                 const bool updateDefault = state.isDefault();
 
-                state.setName(newName);
+                state.setName(newName.trimmed());
 
                 if (updateDefault)
                     state.setAsDefault();