The test added in bug 417418 seems to leave the widget in a bad state because it synthesizes mouse-down events without any mouse-up events (at least in e10s environments). It even generates an assertion indicating a drag session (stack attached) which was papered over in bug 936092 . The bad state is causing my new test in bug 1161634 to fail, so I would like to fix it.  https://bugzilla.mozilla.org/show_bug.cgi?id=936092#c109
Try push in progress at https://treeherder.mozilla.org/#/jobs?repo=try&revision=88d713306d55
Assignee: nobody → bugmail.mozilla
Attachment #8604143 - Flags: review?(ehsan)
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