REPORT-57128&REPORT-57657 优化代码冗余逻辑

designer-form/src/main/java/com/fr/design/mainframe/FormSpacingLineDrawer.java

@@ -137,18 +137,15 @@ public class FormSpacingLineDrawer {
     }
 
     private boolean isSelectedParaComponent() {
-        return designer.getSelectionModel().getSelection().size() == 1 &&
-                designer.getParaComponent() == designer.getSelectionModel().getSelection().getSelectedCreator();
+        return designer.getParaComponent() == designer.getSelectionModel().getSelection().getSelectedCreator();
     }
 
     private boolean isSelectedRootComponent() {
-        return designer.getSelectionModel().getSelection().size() == 1 &&
-                designer.isRoot(designer.getSelectionModel().getSelection().getSelectedCreator());
+        return designer.isRoot(designer.getSelectionModel().getSelection().getSelectedCreator());
     }
 
     private boolean isSelectedForm() {
-        return designer.getSelectionModel().getSelection().size() == 1 &&
-                designer.getSelectionModel().getSelection().getSelectedCreator().getParent() == null;
+        return designer.getSelectionModel().getSelection().getSelectedCreator().getParent() == null;
     }
 
     private boolean isNeedExtendedLine(AbstractFormParallelLine[] nearestSides) {