Old commits of the commits timeline is not updated with the main branch in pr page

[hiifong]

Description

Related: #25827

commits timeline of conversation tab have some problem in the pr page,this have a main branch in gitea repo,when merged upstream to the fix branch in local gitea repo, push it to gitea fix branch,new a pull request from fix to main,then fetch upstream to main and merge, push it to gitea main branch,old commits of the commits timeline is not updated with the main branch.

Gitea Version

v1.20+

Can you reproduce the bug on the Gitea demo site?

Yes

Log Gist

No response

Screenshots

No response

Git Version

No response

Operating System

No response

How are you running Gitea?

./gitea web

Database

MySQL

[silverwind]

Yes, I recall this asynchronity between timeline commits and commits list als happens when force-pushing the branch where commits that have been force pushed over are still incorrectly shown in the timeline, but not in the commit list.

I think Gitea may incorrectly treat the timeline commits as append-only while in reality, it can always be completely rewritten.