fix(xwayland): refresh user Xauthority after Xwayland restart

[gugullll]

Xwayland regenerates /tmp/.xauth_ on every start, but treeland-sd only fetched it at startup, on compositor re-registration, or after a failed activation. An in-place restart inside a running compositor triggers none of those, so the user's XAUTHORITY kept stale MIT-MAGIC-COOKIE-1 data and X11 clients failed with "Invalid MIT-MAGIC-COOKIE-1 key".

Add XWaylandAuthChanged instead of reusing SessionChanged: an in-place restart re-generates the auth data without switching the active session, so reusing SessionChanged would also wake the wayland helper into re-running ActivateWayland. Xwayland now subscribes to the new signal, which requires dropping the per-type early return in tryStart().

Xwayland 每次（重）启动都会重新生成 /tmp/.xauth_，但 treeland-sd 只在 进程启动、compositor 重新注册或上次激活失败时才重新获取。compositor 运行期间
的 Xwayland 原地重启不会触发上述任何一条，导致用户 XAUTHORITY 文件保留过期的
MIT-MAGIC-COOKIE-1，X11 客户端报 Invalid MIT-MAGIC-COOKIE-1 key。

新增 XWaylandAuthChanged 而不复用 SessionChanged：原地重启只重新生成认证数据， 并未切换活动会话，复用 SessionChanged 会连带唤醒 wayland helper 重复执行 ActivateWayland。Xwayland 改为订阅新信号，因此需要去掉 tryStart() 中按类型提前 返回的分支。

Log: 修复 Xwayland 重启后用户 XAUTHORITY 未刷新
PMS: BUG-378331
Influence: treeland-sd（xwayland 类型）改订 XWaylandAuthChanged，Xwayland 重启 后用户侧 XAUTHORITY 自动刷新，X11 应用不再报 Invalid MIT-MAGIC-COOKIE-1 key。 新增 D-Bus 信号，旧客户端不受影响。

Summary by Sourcery

Refresh XWayland authentication state after restarts without changing the active session.

New Features:

• Add an XWaylandAuthChanged D-Bus signal to notify clients when XWayland authentication data is regenerated.

Bug Fixes:

• Refresh user XAUTHORITY after in-place XWayland restarts so X11 clients continue authenticating successfully.

Enhancements:

• Update XWayland socket activation to respond to authentication changes without triggering unnecessary Wayland session activation.

[sourcery-ai]

Reviewer's Guide

Adds a dedicated XWaylandAuthChanged D-Bus signal emitted when Xwayland becomes ready, allowing treeland-sd to refresh user XAUTHORITY after in-place restarts. Xwayland activation now listens only for this authentication event, avoiding unnecessary ActivateWayland runs while preserving existing session-change behavior for other types.

Sequence diagram for Xwayland authentication refresh after restart

sequenceDiagram
    participant Xwayland
    participant SessionManager
    participant TreelandDBus as Treeland_DBus
    participant TreelandSD as treeland_sd
    participant X11Client as X11_Client

    Xwayland->>SessionManager: ready
    SessionManager->>TreelandDBus: XWaylandAuthChanged()
    TreelandDBus-->>TreelandSD: XWaylandAuthChanged
    treeland_sd->>Xwayland: activate()
    Xwayland-->>X11Client: refreshed XAUTHORITY
    X11Client->>Xwayland: X11 connection
    Xwayland-->>X11Client: authentication succeeds

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File-Level Changes

Change	Details	Files
Introduce a dedicated D-Bus notification for Xwayland authentication regeneration.	Declare and expose the XWaylandAuthChanged signal in the D-Bus XML and compositor adaptor. Forward SessionManager Xwayland-ready events to the new compositor signal. Emit the notification whenever an Xwayland instance becomes ready, including restarts.	misc/dbus/org.deepin.compositor1.xml src/core/treeland.cpp src/core/treeland.h src/seat/helper.cpp src/session/session.cpp src/session/session.h
Update socket activation so Xwayland refreshes authentication without triggering session activation.	Remove the Xwayland-specific early return that prevented signal subscriptions. Subscribe Xwayland helpers to XWaylandAuthChanged while retaining SessionChanged for other helper types. Disconnect and reconnect using the signal appropriate to each helper type.	src/systemd-socket.cpp

Possibly linked issues

• #unknown: PR直接修复该问题的核心症状：Xwayland重启后自动刷新Xauthority，避免Invalid MIT-MAGIC-COOKIE-1。

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[Copilot]

Copilot review overview

🟢 Approval recommended

No unresolved blocking issues were identified.

Review effort: Lite
Findings: None

What changed in this PR

Refreshes XWayland authentication after in-place restarts without reactivating Wayland sessions.

Changes:

• Adds and propagates XWaylandAuthChanged.
• Updates XWayland socket activation to refresh authentication.
• Removes the XWayland-specific activation bypass.
• Updates the D-Bus interface definition.

File	Description
src/​systemd-socket.cpp	Subscribes XWayland helpers to authentication changes.
src/​session/​session.h	Declares the authentication signal.
src/​session/​session.cpp	Emits the signal when XWayland is ready.
src/​seat/​helper.cpp	Forwards the signal to Treeland.
src/​core/​treeland.h	Declares the compositor signal.
src/​core/​treeland.cpp	Exposes the signal through D-Bus.
misc/​dbus/​org.deepin.compositor1.xml	Documents the new D-Bus signal.

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: gugullll, wineee

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