REPORT-69846 夹在中间的单元格，与其他单元格框选配置边框时，单元格背景颜色会变化

designer-base/src/main/java/com/fr/design/gui/style/BackgroundPane.java

@@ -34,6 +34,11 @@ public class BackgroundPane extends AbstractBasicStylePane {
     //获取当前面板
     protected BackgroundQuickPane currentPane = null;
 
+    /**
+     * 记录上次选中的面板
+     */
+    protected BackgroundQuickPane lastSelectedPane = null;
+
 
     public BackgroundPane() {
         this.initComponents();
@@ -62,6 +67,9 @@ public class BackgroundPane extends AbstractBasicStylePane {
             @Override
             public void itemStateChanged(ItemEvent e) {
                 cardlayout.show(centerPane, (String) typeComboBox.getSelectedItem());
+                if (e.getStateChange() == ItemEvent.DESELECTED) {
+                    lastSelectedPane = currentPane;
+                }
                 currentPane = paneList[typeComboBox.getSelectedIndex()];
                 fireStateChanged();
             }
@@ -144,6 +152,8 @@ public class BackgroundPane extends AbstractBasicStylePane {
                 pane.populateBean(background);
                 typeComboBox.setSelectedIndex(i);
                 currentPane = paneList[i];
+                // 填充 初始化
+                lastSelectedPane = currentPane;
                 return;
             }
         }

designer-base/src/main/java/com/fr/design/gui/style/BorderPane.java

@@ -15,6 +15,7 @@ import com.fr.design.gui.icombobox.LineComboBox;
 import com.fr.design.gui.ilable.UILabel;
 import com.fr.design.layout.TableLayout;
 import com.fr.design.layout.TableLayoutHelper;
+import com.fr.design.mainframe.backgroundpane.NullBackgroundQuickPane;
 import com.fr.design.style.color.NewColorSelectBox;
 import com.fr.design.utils.gui.AdjustWorkBookDefaultStyleUtils;
 import com.fr.general.IOUtils;
@@ -246,7 +247,9 @@ public class BorderPane extends AbstractBasicStylePane implements GlobalNameObse
             style = AdjustWorkBookDefaultStyleUtils.adjustCellElement(Style.DEFAULT_STYLE);
         }
 
-        if (backgroundPane.currentPane.isBackgroundChange()) {
+        boolean isSetNullBackground = backgroundPane.currentPane instanceof NullBackgroundQuickPane
+                && !(backgroundPane.lastSelectedPane instanceof NullBackgroundQuickPane);
+        if (backgroundPane.currentPane.isBackgroundChange() || isSetNullBackground) {
             style = style.deriveBackground(backgroundPane.update());
         }
         if (BORDER_SET.contains(globalNameListener.getGlobalName())) {

designer-base/src/main/java/com/fr/design/mainframe/backgroundpane/NullBackgroundQuickPane.java

@@ -35,7 +35,7 @@ public class NullBackgroundQuickPane extends BackgroundQuickPane {
 
 	@Override
 	public boolean isBackgroundChange() {
-		return true;
+		return false;
 	}
 
     /**