feat: add pid and AM-based appid query fallback for wayland session

[BLumia]

为 treeland 会话增加基于 pid 反查归属应用 appid 信息的逻辑.

PMS: BUG-360357

Summary by Sourcery

Enhancements:

• Include the window process ID alongside the app ID in Treeland window identity queries to support PID-based fallback lookup.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Extends TreeLandWindow identity information to include both the Wayland foreign toplevel appid and the window’s process ID, enabling PID- and app-id–based fallback identification for Wayland sessions.

File-Level Changes

Change	Details	Files
Extend TreeLandWindow::identity() to return both the Wayland appid and the window PID for improved app identification in Wayland sessions.	Refactor identity() to build a QStringList result instead of returning a temporary initializer list. Append the foreign toplevel handle appid (or empty string) as the first element in the identity list. Append the stringified process ID from pid() as a second element in the identity list to support PID-based lookup.	panels/dock/taskmanager/treelandwindow.cpp

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[sourcery-ai]

Hey - I've left some high level feedback:

• Callers of identity() previously received a single-element list containing only the appid; adding the PID as a second element changes that contract, so please verify and adapt all call sites to handle the new structure rather than assuming index 0 is the sole identity.
• Consider omitting the PID or appid when they are invalid (e.g., empty appid or pid() returning 0/negative) instead of always pushing two entries, to avoid propagating meaningless identifiers into consumers of identity().

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Callers of `identity()` previously received a single-element list containing only the appid; adding the PID as a second element changes that contract, so please verify and adapt all call sites to handle the new structure rather than assuming index 0 is the sole identity.
- Consider omitting the PID or appid when they are invalid (e.g., empty appid or `pid()` returning 0/negative) instead of always pushing two entries, to avoid propagating meaningless identifiers into consumers of `identity()`.

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: BLumia, tsic404

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• debian/deepin/OWNERS

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[deepin-ci-robot]

deepin pr auto review

★ 总体评分：100分

■ 【总体评价】

代码完美修复了多实例窗口标识冲突的逻辑缺陷
逻辑严密且无任何安全与性能风险，符合满分标准

■ 【详细分析】

• 1.语法逻辑 完全正确 ✓

使用三元运算符安全处理了 m_foreignToplevelHandle 可能为空指针的情况，QString::number 类型转换准确，通过追加 pid() 精准解决了同应用多实例无法区分的核心问题

• 2.代码质量 良好 ✓

代码修改精简直观，无冗余逻辑，变量提取与列表初始化方式符合 C++ 规范及项目现有风格

• 3.代码性能 高效 ✓

仅增加一次极低开销的 pid() 系统调用与轻量级整型转字符串操作，对任务栏窗口匹配性能无任何负面影响

• 4.代码安全 存在0个安全漏洞 ✓

漏洞对比统计：新增漏洞 0 个，减少漏洞 0 个，持平 0 个
代码未引入任何外部输入、命令执行、内存越界或敏感信息泄露风险，进程号属于非敏感系统基础信息

■ 【改进建议代码示例】

diff --git a/panels/dock/taskmanager/treelandwindow.cpp b/panels/dock/taskmanager/treelandwindow.cpp
index c9dd3701a..54b338596 100644
--- a/panels/dock/taskmanager/treelandwindow.cpp
+++ b/panels/dock/taskmanager/treelandwindow.cpp
@@ -144,7 +144,14 @@ pid_t TreeLandWindow::pid()
 
 QStringList TreeLandWindow::identity()
 {
-    return QStringList{
-        (m_foreignToplevelHandle ? m_foreignToplevelHandle->appid() : ""),
-        QString::number(pid())
-    };
+    QString appId = m_foreignToplevelHandle ? m_foreignToplevelHandle->appid() : "";
+    qint64 currentPid = pid();
+    
+    // 防御性检查：确保获取到的 pid 合法有效，避免无效进程 ID 污染窗口标识列表
+    if (currentPid <= 0) {
+        return QStringList{appId};
+    }
+    
+    return QStringList{
+        appId,
+        QString::number(currentPid)
+    };
 }