CI job log: enable/disable "scroll to top/bottom" buttons when expanding/collapsing log lines

Summary

When expanding/collapsing log lines in the CI job log viewer, the "scroll to top"/"scroll to bottom" buttons don't update.

Steps to reproduce

  1. Go to https://gitlab.com/gitlab-org/gitlab/-/jobs/10935719853
  2. Scroll to bottom (should be done automatically already)
  3. Collapse "Uploading artifacts for successful job"
  4. Expand "Uploading artifacts for successful job"

Example Project

see above

What is the current bug behavior?

The "scroll to bottom" button remains disabled.

What is the expected correct behavior?

The "scroll to bottom" button should become enabled, since the log is now longer than the page and thus, you could scroll to the bottom again.

Relevant logs and/or screenshots

Peek_2025-08-06_16-51

Output of checks

This bug happens on GitLab.com

Results of GitLab environment info

Expand for output related to GitLab environment info

(For installations with omnibus-gitlab package run and paste the output of:
`sudo gitlab-rake gitlab:env:info`)

(For installations from source run and paste the output of:
`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)

Results of GitLab application Check

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of: sudo gitlab-rake gitlab:check SANITIZE=true)

(For installations from source run and paste the output of: sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)

(we will only investigate if the tests are passing)

Possible fixes

The button enable/disable logic is triggered in https://gitlab.com/gitlab-org/gitlab/-/blob/1a4d7c8e5df210b67ac6af9b9347a1e244f44b23/app/assets/javascripts/ci/job_details/job_app.vue#L167-170. The <log> component (https://gitlab.com/gitlab-org/gitlab/-/blob/1a4d7c8e5df210b67ac6af9b9347a1e244f44b23/app/assets/javascripts/ci/job_details/job_app.vue#L317) probably needs to emit an event when lines are collapsed/expanded, so that the updateScroll function can be called then.

Patch release information for backports

If the bug fix needs to be backported in a patch release to a version under the maintenance policy, please follow the steps on the patch release runbook for GitLab engineers.

Refer to the internal "Release Information" dashboard for information about the next patch release, including the targeted versions, expected release date, and current status.

High-severity bug remediation

To remediate high-severity issues requiring an internal release for single-tenant SaaS instances, refer to the internal release process for engineers.

Edited by 🤖 GitLab Bot 🤖