fix bug for +/-

vue-project/my-kintone-plugin/src/components/basic/PluginTableActionIconGroup.vue

@@ -14,7 +14,7 @@ const props = withDefaults(
   defineProps<{
     canAdd?: boolean;
     canDelete?: boolean;
-    tableId: number;
+    tableId: string;
   }>(),
   {
     canAdd: true,
@@ -25,7 +25,12 @@ const props = withDefaults(
 const savedData = inject<SavedData>('savedData') as SavedData;
 const onClick = (type: 'add' | 'remove') => {
   if (type === 'add') {
-    savedData.joinTables.push(createEmptyJoinTable());
+    const currentIndex = savedData.joinTables.findIndex((t) => t.id === props.tableId);
+    if (currentIndex !== -1) {
+      savedData.joinTables.splice(currentIndex + 1, 0, createEmptyJoinTable());
+    } else {
+      savedData.joinTables.push(createEmptyJoinTable());
+    }
   } else if (savedData.joinTables.length > 1) {
     savedData.joinTables = savedData.joinTables.filter((t) => t.id !== props.tableId);
   }