fix(loader): gate wayland platform interface on env

[MyLeeJiEun]

1. Register DQWaylandPlatformInterface only when dde-shell sets DDE_TRAY_LOADER_REGISTER_PLATFORM_INTERFACE, marking the process as hosted by the dockplugin compositor.
2. Register before LoaderApplication construction so systemTheme picks up plugin_manager_v1-synced attributes (active color, theme, fonts) instead of falling back to DTreelandPlatformInterface.
3. Keep the default platform interface on native Wayland/X11 sessions, avoiding regressions outside dockplugin hosting.
4. Add dde-shell (>> 2.0.52) build dependency in debian/control.

Log: Register the Wayland platform interface only when the tray loader is hosted by the dockplugin compositor.
Influence: Tray plugin colors/themes sync only under dockplugin hosting; native sessions unaffected.

fix(loader): 按环境变量注册 Wayland 平台接口

1. 仅在 dde-shell 设置 DDE_TRAY_LOADER_REGISTER_PLATFORM_INTERFACE（即由 dockplugin 合成器托管）时注册 DQWaylandPlatformInterface。
2. 在 LoaderApplication 构造前注册，确保 systemTheme 能获取 plugin_manager_v1 同步的活动色、主题、字体等属性，而非回退到 DTreelandPlatformInterface。
3. 原生 Wayland/X11 会话保持默认平台接口，避免非托管场景回归。
4. debian/control 增加 dde-shell (>> 2.0.52) 构建依赖。

Log: 仅当托盘加载器由 dockplugin 合成器托管时注册 Wayland 平台接口。
PMS: BUG-372253
Influence: 托盘插件仅在 dockplugin 托管时同步活动色与主题，原生会话不受影响。

Summary by Sourcery

Gate Wayland platform interface registration on a dedicated environment variable and ensure it occurs before LoaderApplication initialization to keep native sessions unchanged while enabling dockplugin-hosted tray theming.

Bug Fixes:

• Prevent unintended use of the Wayland platform interface in native Wayland/X11 sessions by registering it only when explicitly requested via an environment variable.

Build:

• Add dde-shell (>> 2.0.52) as a build dependency in debian control to support environment-gated platform interface registration.

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[deepin-ci-robot]

Hi @MyLeeJiEun. Thanks for your PR.

I'm waiting for a linuxdeepin member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Gates registration of the Wayland-specific platform interface on an environment variable set by dde-shell, ensures it is registered before LoaderApplication construction so system theme picks up dockplugin-synced attributes, and adds a debian build dependency on a recent dde-shell.

Sequence diagram for gating DQWaylandPlatformInterface registration on environment variable

sequenceDiagram
    participant LoaderMain
    participant Environment
    participant DPlatformInterfaceFactory
    participant LoaderApplication
    participant DGuiApplicationHelper
    participant systemTheme

    LoaderMain->>Environment: qEnvironmentVariableIsSet(DDE_TRAY_LOADER_REGISTER_PLATFORM_INTERFACE)
    alt env var set
        LoaderMain->>DPlatformInterfaceFactory: registerInterface(lambda DPlatformTheme)
        DPlatformInterfaceFactory-->>systemTheme: use DQWaylandPlatformInterface
    else env var not set
        note over DPlatformInterfaceFactory,systemTheme: DTreelandPlatformInterface remains default
    end

    LoaderMain->>LoaderApplication: LoaderApplication(argc, argv)
    LoaderApplication->>DGuiApplicationHelper: instance()
    DGuiApplicationHelper->>systemTheme: systemTheme
    systemTheme-->>LoaderApplication: plugin_manager_v1 synced attributes (if DQWaylandPlatformInterface)

Loading

File-Level Changes

Change	Details	Files
Gate DQWaylandPlatformInterface registration on an environment variable and move it to run before LoaderApplication construction so system theme initialization uses the correct platform interface only when hosted by the dockplugin compositor.	Replace the previous qAddPreRoutine-based registration that ran on non-X11 platforms with explicit early registration guarded by the DDE_TRAY_LOADER_REGISTER_PLATFORM_INTERFACE environment variable. Document in comments why registration must occur before QCoreApplication/LoaderApplication construction due to early systemTheme initialization via DGuiApplicationHelper. Retain default DTreelandPlatformInterface behavior when the environment variable is not set, keeping native Wayland/X11 sessions unchanged.	src/loader/main.cpp
Declare a build-time dependency on a sufficiently new dde-shell that can set the new environment variable.	Add dde-shell (>> 2.0.52) to the Build-Depends list so the tray loader can rely on the environment-based hosting signal.	debian/control

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: 18202781743, MyLeeJiEun

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[MyLeeJiEun]

/merge

[deepin-bot]

This pr cannot be merged! (status: blocked)

[MyLeeJiEun]

/forcemerge

[deepin-bot]

This pr force merged! (status: blocked)