Bug: Intermittent browser/components/customizableui/test/browser_flexible_space_area.js | Uncaught exception - at chrome://mochikit/content/tests/SimpleTest/EventUtils.js:2817 - Error: No data transfer object after synthesizing the mouse!
Status: RESOLVED
Priority: P5
Resolution: DUPLICATE
Created: 2021-11-15 22:36:34+00:00
Resolved: 2022-07-25 23:09:36+00:00

**Filed by:** mlaza [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=358110440&repo=mozilla-beta
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/S_t_naLbQWiCO0NhQuZ2hQ/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2021-11-15T21:57:13.151Z] 21:57:13     INFO - TEST-START | browser/components/customizableui/test/browser_flexible_space_area.js
[task 2021-11-15T21:57:13.221Z] 21:57:13     INFO - GECKO(1612) | JavaScript error: resource:///modules/UrlbarInput.jsm, line 2953: TypeError: event.target.closest is not a function
[task 2021-11-15T21:57:13.222Z] 21:57:13     INFO - TEST-INFO | started process screencapture
[task 2021-11-15T21:57:15.530Z] 21:57:15     INFO - TEST-INFO | screencapture: exit 0
[task 2021-11-15T21:57:15.530Z] 21:57:15     INFO - Buffered messages logged at 21:57:13
[task 2021-11-15T21:57:15.530Z] 21:57:15     INFO - Entering test bound test_flexible_space_addition
[task 2021-11-15T21:57:15.531Z] 21:57:15     INFO - Buffered messages finished
[task 2021-11-15T21:57:15.531Z] 21:57:15     INFO - TEST-UNEXPECTED-FAIL | browser/components/customizableui/test/browser_flexible_space_area.js | Uncaught exception - at chrome://mochikit/content/tests/SimpleTest/EventUtils.js:2817 - Error: No data transfer object after synthesizing the mouse!
[task 2021-11-15T21:57:15.531Z] 21:57:15     INFO - Stack trace:
[task 2021-11-15T21:57:15.531Z] 21:57:15     INFO - synthesizeDragOver@chrome://mochikit/content/tests/SimpleTest/EventUtils.js:2817:11
[task 2021-11-15T21:57:15.531Z] 21:57:15     INFO - synthesizeDrop@chrome://mochikit/content/tests/SimpleTest/EventUtils.js:2939:52
[task 2021-11-15T21:57:15.532Z] 21:57:15     INFO - simulateItemDrag@chrome://mochitests/content/browser/browser/components/customizableui/test/head.js:228:17
[task 2021-11-15T21:57:15.532Z] 21:57:15     INFO - test_flexible_space_addition@chrome://mochitests/content/browser/browser/components/customizableui/test/browser_flexible_space_area.js:32:21
[task 2021-11-15T21:57:15.532Z] 21:57:15     INFO - Leaving test bound test_flexible_space_addition
[task 2021-11-15T21:57:15.533Z] 21:57:15     INFO - Console message: [JavaScript Error: "TypeError: event.target.closest is not a function" {file: "resource:///modules/UrlbarInput.jsm" line: 2953}]
[task 2021-11-15T21:57:15.533Z] 21:57:15     INFO - _on_mousedown@resource:///modules/UrlbarInput.jsm:2953:26
[task 2021-11-15T21:57:15.533Z] 21:57:15     INFO - handleEvent@resource:///modules/UrlbarInput.jsm:425:23
[task 2021-11-15T21:57:15.533Z] 21:57:15     INFO - synthesizeMouseAtPoint@chrome://mochikit/content/tests/SimpleTest/EventUtils.js:628:32
[task 2021-11-15T21:57:15.533Z] 21:57:15     INFO - synthesizeMouse@chrome://mochikit/content/tests/SimpleTest/EventUtils.js:562:10
[task 2021-11-15T21:57:15.533Z] 21:57:15     INFO - synthesizeMouseAtCenter@chrome://mochikit/content/tests/SimpleTest/EventUtils.js:735:10
[task 2021-11-15T21:57:15.533Z] 21:57:15     INFO - synthesizeDragOver@chrome://mochikit/content/tests/SimpleTest/EventUtils.js:2805:26
[task 2021-11-15T21:57:15.533Z] 21:57:15     INFO - synthesizeDrop@chrome://mochikit/content/tests/SimpleTest/EventUtils.js:2939:52
[task 2021-11-15T21:57:15.533Z] 21:57:15     INFO - simulateItemDrag@chrome://mochitests/content/browser/browser/components/customizableui/test/head.js:228:17
[task 2021-11-15T21:57:15.533Z] 21:57:15     INFO - test_flexible_space_addition@chrome://mochitests/content/browser/browser/components/customizableui/test/browser_flexible_space_area.js:32:21
[task 2021-11-15T21:57:15.533Z] 21:57:15     INFO - 
[task 2021-11-15T21:57:15.534Z] 21:57:15     INFO - GECKO(1612) | MEMORY STAT | vsize 16500MB | residentFast 511MB | heapAllocated 213MB
[task 2021-11-15T21:57:15.534Z] 21:57:15     INFO - TEST-OK | browser/components/customizableui/test/browser_flexible_space_area.js | took 103ms
[task 2021-11-15T21:57:15.534Z] 21:57:15     INFO - checking window state
[task 2021-11-15T21:57:15.535Z] 21:57:15     INFO - TEST-START | browser/components/customizableui/test/browser_help_panel_cloning.js
```