fix: use QImage::flipped() for Qt6 compatibility

[kt286]

Replace QImage::mirrored() with QImage::flipped() when Qt version >= 6.0.0 to ensure compatibility with Qt6 API changes.

fix: 适配 Qt6 图像翻转 API

在 Qt6 中 QImage::mirrored() 已被 QImage::flipped() 替代， 添加版本检查以确保 Qt5 和 Qt6 的兼容性。

Summary by Sourcery

Support Qt 6 image flipping APIs while preserving compatibility with Qt 5.

Bug Fixes:

• Maintain image flipping compatibility across Qt 5 and newer Qt 6 releases by selecting the appropriate QImage API.

Chores:

• Update the copyright year range for the modified image handling code.

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[sourcery-ai]

Reviewer's Guide

Ensure Qt5/Qt6 compatibility by conditionally using QImage::flipped() instead of QImage::mirrored() for image flipping operations and updating copyright years.

Flow diagram for Qt-version-compatible image flipping

flowchart TD
    A[Image flip requested] --> B{Qt version >= 6.0.0}
    B -->|Yes| C[QImage.flipped]
    B -->|No| D[QImage.mirrored]
    C --> E[Flipped QImage]
    D --> E

Loading

File-Level Changes

Change	Details	Files
Add Qt version-conditional image flipping to support Qt6 while preserving Qt5 behavior.	Wrap image flip calls in adjustImageToRealOrientation() with QT_VERSION checks and use QImage::flipped() in Qt6 builds for horizontal/vertical flips while retaining QImage::mirrored() for Qt5. Update flipHorizontal() and flipVertical() helpers to use QImage::flipped() under Qt6 and QImage::mirrored() under Qt5. Extend SPDX-FileCopyrightText year range to 2026.	src/util/dimagehandler.cpp

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[BLumia]

应该检查 6.9 而不是 6.0

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: BLumia, kt286

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