KERNEL-8038 设计器存在一些静态方法导致最近关闭的模板对象不释放内存

designer-form/src/main/java/com/fr/design/mainframe/widget/ui/FormWidgetCardPane.java

@@ -24,7 +24,6 @@ import com.fr.design.layout.FRGUIPaneFactory;
 import com.fr.design.mainframe.DesignerContext;
 import com.fr.design.mainframe.EastRegionContainerPane;
 import com.fr.design.mainframe.FormDesigner;
-import com.fr.design.mainframe.FormSelectionUtils;
 import com.fr.design.mainframe.JForm;
 import com.fr.design.widget.DataModify;
 import com.fr.design.widget.FormWidgetDefinePaneFactoryBase;