(In reply to amarc from comment #21) > * [Push with failures](https://treeherder.mozilla.org/jobs?repo=autoland&duplicate_jobs=visible&group_state=expanded&resultStatus=testfailed%2Cbusted%2Cexception%2Crunnable&revision=a77158ef95d1e6afa95f91792c4878c36ec787af) Oh, all failures are on GeckoView, the APZ controller of GeckoView lives in different thread, I guess the [mIsSynthesizedForTests flag](https://searchfox.org/firefox-main/rev/feefed22c39dfd86ec2468960366db989c8a6fbd/dom/base/nsContentUtils.cpp#9673-9674) isn't [propagated](https://searchfox.org/firefox-main/rev/feefed22c39dfd86ec2468960366db989c8a6fbd/widget/nsIWidget.cpp#1348-1350) correctly, so the async synthesized `mousemove` event is ignored...
Bug 2008277 Comment 22 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
(In reply to amarc from comment #21) > * [Push with failures](https://treeherder.mozilla.org/jobs?repo=autoland&duplicate_jobs=visible&group_state=expanded&resultStatus=testfailed%2Cbusted%2Cexception%2Crunnable&revision=a77158ef95d1e6afa95f91792c4878c36ec787af) Oh, all failures are on GeckoView, the APZ controller of GeckoView lives in different thread, I guess the [mIsSynthesizedForTests flag](https://searchfox.org/firefox-main/rev/feefed22c39dfd86ec2468960366db989c8a6fbd/dom/base/nsContentUtils.cpp#9673-9674) isn't [propagated](https://searchfox.org/firefox-main/rev/feefed22c39dfd86ec2468960366db989c8a6fbd/widget/nsIWidget.cpp#1348-1350) correctly, so the async synthesized `mousemove` event is always ignored by `EventStateManager`...
(In reply to amarc from comment #21) > * [Push with failures](https://treeherder.mozilla.org/jobs?repo=autoland&duplicate_jobs=visible&group_state=expanded&resultStatus=testfailed%2Cbusted%2Cexception%2Crunnable&revision=a77158ef95d1e6afa95f91792c4878c36ec787af) ~Oh, all failures are on GeckoView, the APZ controller of GeckoView lives in different thread, I guess the [mIsSynthesizedForTests flag](https://searchfox.org/firefox-main/rev/feefed22c39dfd86ec2468960366db989c8a6fbd/dom/base/nsContentUtils.cpp#9673-9674) isn't [propagated](https://searchfox.org/firefox-main/rev/feefed22c39dfd86ec2468960366db989c8a6fbd/widget/nsIWidget.cpp#1348-1350) correctly, so the async synthesized `mousemove` event is always ignored by `EventStateManager`...~ Err, hmm, probably something else...