REPORT-4332 & REPORT-3740 9.0设计器表单花屏问题;[9.0一轮回归]表单显示异常

designer_form/src/com/fr/design/mainframe/FormArea.java

@@ -86,8 +86,6 @@ public class FormArea extends JComponent implements ScrollRulerComponent {
         }
         this.setFocusTraversalKeysEnabled(false);
         this.designer.addMouseWheelListener(showValSpinnerMouseWheelListener);
-        this.setOpaque(true);
-        this.setBackground(Color.WHITE);
     }
 
     MouseWheelListener showValSpinnerMouseWheelListener = new MouseWheelListener() {

designer_form/src/com/fr/design/mainframe/JForm.java

@@ -220,7 +220,10 @@ public class JForm extends JTemplate<Form, FormUndoState> implements BaseJForm {
         formDesign = new FormDesigner(this.getTarget(), new TabChangeAction(BaseJForm.ELEMENTCASE_TAB, this));
         WidgetToolBarPane.getInstance(formDesign);
         FormArea area = new FormArea(formDesign);
-        centerPane.add(area, BorderLayout.CENTER);
+        JPanel areaWrapper = new JPanel(new BorderLayout());
+        areaWrapper.add(area, BorderLayout.CENTER);
+        areaWrapper.setBackground(Color.white);
+        centerPane.add(areaWrapper, BorderLayout.CENTER);
         tabCenterPane.add(centerPane, FORM_CARD, FORM_TAB);
         this.add(tabCenterPane, BorderLayout.CENTER);