sync: from linuxdeepin/dtkwidget

Synchronize source files from linuxdeepin/dtkwidget.

Source-pull-request: linuxdeepin/dtkwidget#569

src/widgets/dapplication.cpp

@@ -1539,6 +1539,19 @@ bool DApplication::notify(QObject *obj, QEvent *event)
         }
     }
 
+#if QT_VERSION < QT_VERSION_CHECK(6, 4, 0)
+    if (event->type() == QEvent::KeyPress && obj == focusWidget()) {
+        if (auto keyEvent = dynamic_cast<QKeyEvent *>(event)) {
+            if (keyEvent->key() == Qt::Key_Return || keyEvent->key() == Qt::Key_Enter) {
+                if (auto btn = qobject_cast<QAbstractButton *>(obj)) {
+                    Q_EMIT btn->clicked();
+                    return true;
+                }
+            }
+        }
+    }
+#endif
+
     if (event->type() == QEvent::ApplicationFontChange) {
         // ApplicationFontChange 调用 font() 是 ok 的，如果在 fontChanged 中调用在某些版本中会出现 deadlock
         DFontSizeManager::instance()->setFontGenericPixelSize(static_cast<quint16>(DFontSizeManager::fontPixelSize(font())));