2040275 - Print WPTs trigger "leakcheck large nsGlobalWindowInner" due to leaving some objects in an unbroken cycle

Status: NEW

(Core :: Printing: Output, defect)

Description

[Daniel Holbert [:dholbert]]

I'm spinning this off to address the leak that we identified in bug 2038448 (and bug 2034619, for the same test), as well as for the leak here:
https://searchfox.org/firefox-main/rev/ca47ec6bb1f3e46a384cd1ebb11c5996cceef90f/testing/web-platform/meta/css/printing/__dir__.ini#1
...which is to allow the leak in logs like this one ( TEST-UNEXPECTED-FAIL | leakcheck large nsGlobalWindowInner | /css/printing):
https://treeherder.mozilla.org/logviewer?job_id=561198104&repo=try&task=UQ_GmZTXTCuOs_dVN5aAjA.0&lineNumber=12367

Comment 1

[Daniel Holbert [:dholbert]]

(might not get to this right away; we're thinking that this depends in part on silent-printing and perhaps also system-print-dialog usage, so most users are probably unaffected. Based on that, and based on the fact that this is probably a longstanding issue that we're only just noticing in CI now [due to leaks just starting to be properly reported per bug 2038448 comment 9], calling this S3.