fix(dfm-mount): stop GMountOperation signal emission to prevent premature UNHANDLED reply

[pppanghu77]

问题现象

首次登录挂载 SFTP 时，在主机密钥确认框点击「仍然登录」后，挂载失败并弹窗提示：挂载失败，密码对话框被取消（gvfs: "Password dialog cancelled"），用户实际从未取消任何对话框。低性能/界面繁忙环境（如 FT-D2000）上稳定复现。

根因

gio 的 GMountOperation 默认类处理器（G_SIGNAL_RUN_LAST）会在实例处理器返回后，通过 idle（G_PRIORITY_DEFAULT_IDLE）异步回复 G_MOUNT_OPERATION_UNHANDLED（glib/gio/gmountoperation.c reply_non_handled_in_idle）。

首次登录 SFTP 的完整触发链：

1. gvfs sftp 后端先发 ask-question（主机密钥确认）。dfm-mount 应答 HANDLED 后，gio 默认处理器仍会调度上述 UNHANDLED 残留 idle；
2. gvfs 接着发 AskPassword DBus 调用。若客户端主循环繁忙（idle 被饿死），该 DBus 派发（G_PRIORITY_DEFAULT）会先于残留 idle 执行，弹出密码对话框（嵌套事件循环）；
3. 残留 idle 在对话框的嵌套循环中触发 → g_mount_operation_reply(op, UNHANDLED) 命中此刻已连接的临时 reply 处理器（gmountoperationdbus.c）→ 挂载操作以 handled=FALSE 被提前作答；
4. gvfs 侧 aborted=TRUE → G_IO_ERROR_FAILED_HANDLED + "Password dialog cancelled"。

只有首次登录才有主机密钥询问（残留 idle 的唯一来源），与缺陷「前置条件：未登录过 sftp」完全吻合。

修复

在 mountByGvfsAskQuestion / mountByGvfsAskPasswd 入口调用 g_signal_stop_emission_by_name()，与 gvfs 官方客户端实现（gmountsource.c op_ask_password/op_ask_question）做法一致。两个处理器的所有返回路径均已显式调用 g_mount_operation_reply（HANDLED/ABORTED），停止默认处理器不会留下未应答的 DBus 调用；对 SMB/FTP 非首次登录流程无行为影响。

验证

最小 gio 复现程序（本机 UOS 20 + gvfs 1.38 + glib 2.58.3，paramiko 模拟 SFTP 服务器）三组对照：

模式	条件	结果
plain	立即应答（对照）	挂载成功
busy	模拟界面繁忙 + 密码对话框嵌套事件循环	失败，报「密码对话框被取消」（G_IO_ERROR_FAILED_HANDLED=30），与缺陷一致
fixed	同 busy + stop_emission	挂载成功

Log: 修复首次登录挂载sftp点击仍然登录后提示挂载失败密码对话框被取消
Influence: sftp/ftp/smb 挂载过程中密码与主机密钥确认对话框交互不再被 gio 默认处理器竞态打断

Summary by Sourcery

Prevent GIO mount-operation signal races from prematurely aborting interactive SFTP mounts.

Bug Fixes:

• Prevent premature GMountOperation replies from causing first-time SFTP mounts to fail with a misleading “Password dialog cancelled” error.
• Ensure host-key and password prompts are not interrupted by stale GIO default signal handling during nested event-loop activity.

Bug: https://pms.uniontech.com/bug-view-376305.html

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The PR fixes a GLib signal-handler race in GVFS mounting by stopping the default ask-question and ask-password emissions, ensuring custom handlers explicitly reply and preventing stale UNHANDLED responses from prematurely aborting first-time SFTP mounts.

File-Level Changes

Change	Details	Files
Stop GLib’s default GMountOperation handlers from scheduling stale UNHANDLED replies during question and password prompts.	Stop emission of the ask-question signal before custom handling. Stop emission of the ask-password signal before custom handling. Retain explicit HANDLED/ABORTED replies on all custom-handler paths to ensure each DBus request is answered.	src/dfm-mount/private/dnetworkmounter.cpp
Prevent a first-time SFTP host-key prompt race from being misreported as password-dialog cancellation.	Avoid residual idle callbacks completing the mount operation inside the password dialog’s nested event loop. Preserve expected behavior for SFTP, FTP, and SMB authentication and confirmation flows.	src/dfm-mount/private/dnetworkmounter.cpp

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Johnson-zs, pppanghu77

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[pppanghu77]

/merge