Given the print APIs in the testcase -- in the regression range, probably would have been a "regression" from:
> 697defcfbb465411f43de91a5af86d0227d851c2 Jonathan Watt — Bug 1745452 - Remove the print progress dialog code. r=mstriemer,bobowen,webdriver-reviewers
Bug 1789934 Comment 3 Edit History
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Given the print APIs in the testcase -- in the regression range, probably would have been a "regression" from:
> 697defcfbb465411f43de91a5af86d0227d851c2 Jonathan Watt — Bug 1745452 - Remove the print progress dialog code. r=mstriemer,bobowen,webdriver-reviewers
("regression" in quotes since presumably the underlying bug predated that change, but maybe was harder to trigger or required a different testcase.)