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You can quickly look up the history for any screenshot. This tool is useful to bisect regressions that might've been missed during the review process.
On a report, you can access the history by clicking on the Full History link on any screenshot.
Be aware that the history link always shows the latest history for a screenshot, even if you open the link from an old report.
For a given run, you can access the history for a screenshot by searcing for the screenshot and then clicking the History link.
The history of a screenshot is based on the promotion history for the given channel. Since promotions only happen on the main or master branch, this is the only branch on which history is currently available.
We start from the latest promoted run, and keep walking back in time to it's previous promoted run. We report any time the PNG file associated with the image has changed for the given screenshot name. We ignore commits where no change was made.
If you rename a screenshot, we suggest not making changes to the screenshot in the same commit. The history tool can track history of the screenshot across renames as long as the image remained the same.
On the History page, you can click the Compare link to compare a screenshot to its previous version. For more information on the Compare tool, read the documentation on Comparing Images