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[build] Hide stale build failure comment when a re-run succeeds#26012

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[build] Hide stale build failure comment when a re-run succeeds#26012
rolfbjarne wants to merge 1 commit into
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dev/rolf/cuddly-umbrella

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Since 6d24fb6 ([build] Only report build failures, not successes) we stopped posting a comment on successful builds. That introduced a side effect: if a build first fails (posting a "Build failed" comment) and then passes on a re-run of the same commit, the stale failure comment was never hidden, leaving misleading output on the PR.

The reason is that hiding previous same-id comments only happened inside NewCommentFromMessage (via HandlePreviousCommentHiding), which the success path now skips by returning early.

This change makes the "Report build result" step, on success, call $githubComments.HandlePreviousCommentHiding("build $(System.JobDisplayName)") before returning. That hides any previous build failure comment for the same job while still not posting a new "Build passed" comment. The existing safeguards apply: comments are only hidden when the current commit is the latest in the PR, and nothing happens when not running in a PR context.

🤖 Pull request created by Copilot

After 6d24fb6 we stopped posting a comment on successful builds. But this
had a side effect: if a build first fails (posting a 'Build failed' comment)
and then passes on a re-run, the stale failure comment was never hidden.

Now the 'Report build result' step hides any previous build failure comment
for the same job when the build succeeds, instead of just skipping.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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@rolfbjarne rolfbjarne marked this pull request as ready for review July 10, 2026 09:49
Copilot AI review requested due to automatic review settings July 10, 2026 09:49

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Pull request overview

This PR fixes a CI UX regression in the Azure Pipelines “Report build result” step: when a job failed once (posting a “Build failed” PR comment) and then succeeded on a re-run for the same commit, the old failure comment remained visible and misleading.

Changes:

  • On successful job completion, initialize the GitHub comments helper and call HandlePreviousCommentHiding("build $(System.JobDisplayName)") before returning.
  • Keep the existing behavior of not posting a “Build passed” comment on success, while still cleaning up any stale prior failure comment for the same job.
  • Leave the failure path unchanged (still posts a “Build failed” comment with the same comment id).

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✅ API diff for current PR / commit

NET (empty diffs)

✅ API diff vs stable

NET (empty diffs)

ℹ️ Generator diff

Generator Diff: vsdrops (html) vsdrops (raw diff) gist (raw diff) - Please review changes)

Pipeline on Agent
Hash: c8f354f323eae0641634dd28c2aeaa47a2e55d47 [PR build]

@rolfbjarne rolfbjarne enabled auto-merge (squash) July 10, 2026 13:25
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🚀 [CI Build #c8f354f] Test results 🚀

Test results

✅ All tests passed on VSTS: test results.

🎉 All 199 tests passed 🎉

Tests counts

✅ assembly-processing: All 1 tests passed. Html Report (VSDrops) Download
✅ cecil: All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (iOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (MacCatalyst): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (macOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (Multiple platforms): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (tvOS): All 1 tests passed. Html Report (VSDrops) Download
✅ framework: All 2 tests passed. Html Report (VSDrops) Download
✅ fsharp: All 4 tests passed. Html Report (VSDrops) Download
✅ generator: All 5 tests passed. Html Report (VSDrops) Download
✅ interdependent-binding-projects: All 4 tests passed. Html Report (VSDrops) Download
✅ introspection: All 4 tests passed. Html Report (VSDrops) Download
✅ linker (iOS): All 15 tests passed. Html Report (VSDrops) Download
✅ linker (MacCatalyst): All 15 tests passed. Html Report (VSDrops) Download
✅ linker (macOS): All 21 tests passed. Html Report (VSDrops) Download
✅ linker (tvOS): All 15 tests passed. Html Report (VSDrops) Download
✅ monotouch (iOS): All 18 tests passed. [attempt 2] Html Report (VSDrops) Download
✅ monotouch (MacCatalyst): All 17 tests passed. Html Report (VSDrops) Download
✅ monotouch (macOS): All 18 tests passed. Html Report (VSDrops) Download
✅ monotouch (tvOS): All 18 tests passed. Html Report (VSDrops) Download
✅ msbuild: All 2 tests passed. Html Report (VSDrops) Download
✅ sharpie: All 1 tests passed. Html Report (VSDrops) Download
✅ windows: All 3 tests passed. Html Report (VSDrops) Download
✅ xcframework: All 4 tests passed. Html Report (VSDrops) Download
✅ xtro: All 1 tests passed. Html Report (VSDrops) Download

macOS tests

✅ Tests on macOS Monterey (12): All 5 tests passed. Html Report (VSDrops) Download
✅ Tests on macOS Ventura (13): All 5 tests passed. Html Report (VSDrops) Download
✅ Tests on macOS Sonoma (14): All 5 tests passed. Html Report (VSDrops) Download
✅ Tests on macOS Sequoia (15): All 5 tests passed. Html Report (VSDrops) Download
✅ Tests on macOS Tahoe (26): All 5 tests passed. Html Report (VSDrops) Download

Linux Build Verification

Linux build succeeded

Pipeline on Agent
Hash: c8f354f323eae0641634dd28c2aeaa47a2e55d47 [PR build]

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