fix(window): fix isEnabled() for Windows platform

[kt286]

On Windows, DPlatformHandle doesn't support isEnabledDXcb which is a Linux-specific function. Return handle existence directly instead to ensure the window reports correctly as enabled on Windows.

fix(window): 修复 Windows 平台下 isEnabled() 的兼容性问题

DPlatformHandle::isEnabledDXcb 仅在 Linux 下可用，在 Windows 上直接返回 handle 是否存在以正确报告窗口启用状态。

Summary by Sourcery

Bug Fixes:

• Ensure DQuickWindowAttached::isEnabled() correctly reports enabled state on Windows by falling back to handle existence when DXcb-specific checks are unavailable.

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: kt286

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds Windows-specific handling for DQuickWindowAttached::isEnabled() by returning whether the platform handle exists on Windows, while keeping the existing Xcb/Wayland logic for other platforms.

Flow diagram for updated DQuickWindowAttached::isEnabled platform logic

flowchart TD
    A[call isEnabled] --> B[check platform]
    B -->|Q_OS_WIN| C[return d->handle != nullptr]
    B -->|other platforms| D["return d->handle && (DPlatformHandle::isEnabledDXcb(window() || DGuiApplicationHelper::testAttribute(IsWaylandPlatform))"]

Loading

File-Level Changes

Change	Details	Files
Introduce Windows-specific branch in DQuickWindowAttached::isEnabled() to base enabled status on handle existence instead of Xcb-specific checks.	Wrap isEnabled() logic in a Q_OS_WIN preprocessor conditional On Windows, return true when the internal platform handle pointer is non-null On non-Windows platforms, preserve existing behavior that checks DPlatformHandle::isEnabledDXcb and a Wayland attribute	src/dquickwindow.cpp

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