[wineee]

1. set_source on an existing group member now promotes it to source
2. remove the duplicate_output failure case from set_source description
3. keep duplicate_output only for add_output duplicate additions

Log: No user-facing changes

Influence:

1. Verify set_source on a current mirror promotes it to source on commit
2. Verify no operation_failed duplicate_output is emitted by set_source
3. Verify add_output on an existing member still reports duplicate_output

docs: 对齐 set_source duplicate_output 措辞与实现

1. set_source 对本组已有成员现改为直接提升为源
2. 从 set_source 描述中移除 duplicate_output 失败情形
3. duplicate_output 仅保留给 add_output 的重复添加

Log: 无用户可见变化

Influence:

1. 验证对当前 mirror 调用 set_source 提交后将其提升为源
2. 验证 set_source 不再发送 operation_failed duplicate_output
3. 验证对已有成员调用 add_output 仍返回 duplicate_output

PMS: TASK-395091

Summary by Sourcery

Update output-group protocol documentation to accurately describe set_source promotion and error behavior.

Enhancements:

• Align the output-group protocol documentation with set_source behavior by documenting promotion of existing members and removing duplicate_output from its failure conditions.

Documentation:

• Clarify that duplicate_output applies to duplicate add_output requests while set_source promotes existing group members, including current mirrors.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the output-group protocol documentation to match implementation: set_source now directly promotes an existing member, including a current mirror, without emitting duplicate_output, while duplicate additions remain associated with add_output.

File-Level Changes

Change	Details	Files
Align the set_source protocol documentation with the compositor’s promotion behavior for existing group members.	Document that an existing mirror is promoted directly to the configured source and the mirror list is re-resolved. Remove duplicate_output from set_source failure conditions while retaining invalid_output and output_in_use. Clarify idempotent behavior when setting the already effective source and distinguish it from the existing-member promotion path.	dde/treeland-output-group-manager-unstable-v1.xml
Constrain duplicate_output semantics to duplicate add_output requests.	Ensure the set_source documentation no longer instructs clients to remove an existing member first. Preserve duplicate_output as the documented result for repeated output additions.	dde/treeland-output-group-manager-unstable-v1.xml

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

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