fix: Boxshadow displays abnormally in fractional scaling scenarios

- Temporary solution

Author: zzxyb

src/private/dquickborderimage.cpp

@@ -0,0 +1,27 @@
+// SPDX-FileCopyrightText: 2024 - 2025 UnionTech Software Technology Co., Ltd.
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+#include "dquickborderimage.h"
+
+#include <private/qquickitem_p.h>
+#include <private/qquickborderimage_p_p.h>
+
+DQUICK_BEGIN_NAMESPACE
+
+DQuickBorderImage::DQuickBorderImage(QQuickItem *parent)
+    :QQuickBorderImage(parent)
+{
+}
+
+void DQuickBorderImage::itemChange(ItemChange change, const ItemChangeData &value)
+{
+    if (change == ItemDevicePixelRatioHasChanged &&
+        value.realValue != static_cast<QQuickBorderImagePrivate *>(QQuickItemPrivate::get(this))->devicePixelRatio) {
+        return;
+    }
+
+    QQuickBorderImage::itemChange(change, value);
+}
+
+DQUICK_END_NAMESPACE

src/private/dquickborderimage.h

@@ -0,0 +1,30 @@
+// SPDX-FileCopyrightText: 2024 - 2025 UnionTech Software Technology Co., Ltd.
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+#ifndef DQUICKBORDERIMAGE_H
+#define DQUICKBORDERIMAGE_H
+
+#include <dtkdeclarative_global.h>
+
+#include <private/qquickimagebase_p.h>
+#include <private/qquickborderimage_p.h>
+
+DQUICK_BEGIN_NAMESPACE
+
+class DQuickBorderImage : public QQuickBorderImage
+{
+    Q_OBJECT
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    QML_NAMED_ELEMENT(DBorderImage)
+#endif
+public:
+    DQuickBorderImage(QQuickItem *parent=nullptr);
+
+protected:
+    void itemChange(ItemChange change, const ItemChangeData &value) override;
+};
+
+DQUICK_END_NAMESPACE
+
+#endif // DQUICKBORDERIMAGE_H

src/qml/BoxShadow.qml

@@ -26,7 +26,7 @@ Item {
     readonly property real __minImageSize: 2 * __borderBase
     readonly property real __boxSize: __minImageSize - 2 * shadowBlur - 2 * __spread + 1
 
-    BorderImage {
+    D.DBorderImage {
         id: image
 
         anchors {