Bug: Intermittent browser/base/content/test/performance/browser_tabopen.js | unexpected changed rect: ({x1:11, x2:230, y1:0, y2:43, w:220, h:44}), window width: 1280 -
Status: RESOLVED
Priority: P5
Resolution: INCOMPLETE
Created: 2022-05-19 04:45:56+00:00
Resolved: 2022-06-14 17:05:07+00:00

**Filed by:** imoraru [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=378574964&repo=mozilla-beta
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/J7jbM5r1QmKflwbDgNmfUw/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2022-05-19T04:07:29.653Z] 04:07:29     INFO - TEST-START | browser/base/content/test/performance/browser_tabopen.js
[task 2022-05-19T04:07:30.028Z] 04:07:30     INFO - TEST-INFO | started process screenshot
[task 2022-05-19T04:07:30.129Z] 04:07:30     INFO - TEST-INFO | screenshot: exit 0
[task 2022-05-19T04:07:30.138Z] 04:07:30     INFO - Buffered messages logged at 04:07:29
[task 2022-05-19T04:07:30.138Z] 04:07:30     INFO - Entering test bound 
[task 2022-05-19T04:07:30.139Z] 04:07:30     INFO - tabStripRect={"x":0,"y":0,"width":1022,"height":44,"top":0,"right":1022,"bottom":44,"left":0}
[task 2022-05-19T04:07:30.140Z] 04:07:30     INFO - firstTabRect={"x":32,"y":0,"width":225,"height":44,"top":0,"right":257,"bottom":44,"left":32}
[task 2022-05-19T04:07:30.140Z] 04:07:30     INFO - tabPaddingStart=2
[task 2022-05-19T04:07:30.141Z] 04:07:30     INFO - firstTabLabelRect={"x":42,"y":11.800003051757812,"width":45,"height":20.399993896484375,"top":11.800003051757812,"right":87,"bottom":32.19999694824219,"left":42}
[task 2022-05-19T04:07:30.141Z] 04:07:30     INFO - newTabButtonRect={"x":0,"y":0,"width":0,"height":0,"top":0,"right":0,"bottom":0,"left":0}
[task 2022-05-19T04:07:30.142Z] 04:07:30     INFO - textBoxRect={"x":274.8500061035156,"y":50,"width":790.2833251953125,"height":28,"top":50,"right":1065.1333312988281,"bottom":78,"left":274.8500061035156}
[task 2022-05-19T04:07:30.143Z] 04:07:30     INFO - TEST-PASS | browser/base/content/test/performance/browser_tabopen.js | 0 unexpected reflows - true == true - 
[task 2022-05-19T04:07:30.143Z] 04:07:30     INFO - comparing 6 frames
[task 2022-05-19T04:07:30.143Z] 04:07:30     INFO - Buffered messages finished
[task 2022-05-19T04:07:30.145Z] 04:07:30     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_tabopen.js | unexpected changed rect: ({x1:11, x2:230, y1:0, y2:43, w:220, h:44}), window width: 1280 - 
[task 2022-05-19T04:07:30.145Z] 04:07:30     INFO - Stack trace:
[task 2022-05-19T04:07:30.145Z] 04:07:30     INFO - chrome://mochikit/content/browser-test.js:test_ok:1394
[task 2022-05-19T04:07:30.145Z] 04:07:30     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker/rects<:633
[task 2022-05-19T04:07:30.145Z] 04:07:30     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker:624
[task 2022-05-19T04:07:30.145Z] 04:07:30     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:withPerfObserver:693
[task 2022-05-19T04:07:30.145Z] 04:07:30     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-05-19T04:07:30.146Z] 04:07:30     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_tabopen.js | unexpected changed rect: ({x1:1002, x2:1008, y1:16, y2:27, w:7, h:12}), window width: 1280 - 
[task 2022-05-19T04:07:30.146Z] 04:07:30     INFO - Stack trace:
[task 2022-05-19T04:07:30.146Z] 04:07:30     INFO - chrome://mochikit/content/browser-test.js:test_ok:1394
[task 2022-05-19T04:07:30.146Z] 04:07:30     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker/rects<:633
[task 2022-05-19T04:07:30.146Z] 04:07:30     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker:624
[task 2022-05-19T04:07:30.146Z] 04:07:30     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:withPerfObserver:693
[task 2022-05-19T04:07:30.147Z] 04:07:30     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-05-19T04:07:30.148Z] 04:07:30     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_tabopen.js | unexpected changed rect: ({x1:1035, x2:1047, y1:16, y2:28, w:13, h:13}), window width: 1280 - 
[task 2022-05-19T04:07:30.148Z] 04:07:30     INFO - Stack trace:
[task 2022-05-19T04:07:30.148Z] 04:07:30     INFO - chrome://mochikit/content/browser-test.js:test_ok:1394
[task 2022-05-19T04:07:30.148Z] 04:07:30     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/head.js:reportUnexpectedFlicker/rects<:633
<...>

```