REPORT-4634 组件叠加体验优化=>bug修改=>修复鼠标快速移出，缩略图未关闭的问题

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

@@ -42,13 +42,19 @@ public class ComponentTree extends JTree {
         this.setDropMode(DropMode.ON_OR_INSERT);
         this.setTransferHandler(new TreeTransferHandler());
         this.refreshTreeRoot();
-        addTreeSelectionListener(designer);
-        addMouseMotionListener(new ComponetTreeMouseListener(this));
+        initListeners();
         setEditable(true);
         setUI(uiTreeUI);
         setBorder(BorderFactory.createEmptyBorder(PADDING_TOP, PADDING_LEFT, 0, 0));
     }
 
+    private void initListeners() {
+        this.addTreeSelectionListener(designer);
+        ComponetTreeMouseListener componetTreeMouseListener = new ComponetTreeMouseListener(this);
+        this.addMouseMotionListener(componetTreeMouseListener);
+        this.addMouseListener(componetTreeMouseListener);
+    }
+
     public FormDesigner getDesigner() {
         return designer;
     }
@@ -276,6 +282,11 @@ public class ComponentTree extends JTree {
                 hidePreviewPane();
             }
         }
+
+        @Override
+        public void mouseExited(MouseEvent e) {
+            hidePreviewPane();
+        }
     }
 
     private class PopupPreviewPane extends JPopupMenu {