fix：v1.3.1修复BUG。

MainWidget.cpp

@@ -18,7 +18,7 @@ MainWidget::MainWidget(QWidget* parent) : QWidget(parent), ui(new Ui::MainWidget
 {
     ui->setupUi(this);
 
-    setWindowTitle(u8"OneLevelXmlOpr v1.3.0");
+    setWindowTitle(u8"OneLevelXmlOpr v1.3.1");
     setWindowIcon(QIcon("://resource/xml.ico"));
 
     QScreen* primaryScreen = QGuiApplication::primaryScreen();
@@ -483,7 +483,7 @@ bool MainWidget::edit_property(Element_t* target, int row)
     }
 
     attri_edit_->get_attribute(property);
-    if (property[0].value != value_pre) {
+    if (property[0].value == value_pre) {
         while (xml_.check_key_exists(property)) {
             CUtil::msg(attri_edit_, u8"不能有相同的key，请检查。");
             attri_edit_->exec();